UnderFill

The Undertale AU

[wdeltag-eng]

Greetings everyone, I am WDeltaG(He/Him), the creator and sole developer of a whole new Undertale multiverse - UnderFill.

UnderFill is a multiverse that is separate from the canonical one. The events and characters in it are greatly changed, but in addition to the changes, there are also many additions. The name of the universe speaks for itself. Every hole, every crack in the canon, is filled with details. If you spend some time to think about everything, you can understand any event that happened once, or is happening now. If you correctly represent each element of the UnderFill in your head, then events can be predicted! Many, but not every one.

My multiverse works exactly according to the rules in it. The laws of physics work there(at least I try very hard to make everything correspond to real physics, while including magic in the system), especially such fundamental ones as the laws of thermodynamics. "Energy does not appear from nowhere and does not disappear anywhere".

Also in UnderFill, there are some new laws and rules that operate one of the most detailed magic systems you will ever meet(especially in this fandom)! And also a whole new scientific study about souls, which I called soulogy, from the words soul and logia(Greek: λόγος) - reason. It is impossible to give this study a full name in Greek, because the ancient Greek word psychē already means "the soul", and psychology and soulogy are two completely different studies. But I will tell you more about this in another post. This post is just an introductory one.

Also in UnderFill there is a full story of the creation and life of the multiverse, but this also is a discussion that needs a separate post.

In addition to the multiverse as a whole, attention is also paid to many individual universes(including the original ones!). The ones that are bound with the plot most strongly are: Undertale(by Toby Fox), Inktale(by Comyet), Errortale(by loverofpigges), Dreamtale(by Joku), Xtale(by Jakei), Aftertale(by loverofpiggies) and many other popular universes. None of those universes belong to me, and I don't try to claim them for myself. It is also necessary to clarify that I respect the canon created by the authors of these universes, and in no way am trying to replace it with my modified copy(many universes are greatly changed, Dreamtale and some others have become completely different). The list of original universes created by myself is much smaller, but it is being expanded as the multiverse evolves. From the original universes, the plot includes: Underfill(the name of the universe itself is written with a lowercase letter "f", in contrast to the name of the multiverse), Underwar, The Morning Star, Dawn of Harmony, and others. I will make separate posts in order to show the changes in each universe and explain all the original ones.

I will try to release posts as often as possible. I hope you enjoy my work.

P.S. Also I'm Russian and my English can be weird sometimes, I'm sorry for that.

[wdeltag-eng]

Fill!Gaster's Marksman Rifle - Legacy

The animation consists of a 100 unique frames and plays for 20 seconds. I've made it on my phone in 7 hours or something.

The History

This rifle was created by Gaster's mother - Calibri. Calibri was studying firearms, gunpowder and ballistics for a very long time. That knowledge gave her the opportunity to create her own firearm, which she exploited. The rifle didn't have a name until Gaster named it.

When Gaster got Legacy in his own hands, it became his best friend right until the last shot.

Specifications

General

Legacy is a single-shot energy-magical marksman rifle that uses 10×100mm (.40 LG) caliber, the bullets of which travel at the speed of 1800m/s (6000f/s) and may deliver up to 12kJ of kinetic energy.

Length: 80cm (32 in.)

Mass: 8kg (18 lbs.)

Energy-magical system

Legacy has a built-in magical mechanism that is able to:

Activate the cartridge capsules

Enhance the sight optics

Fix the damage dealt to the rifle

Dampen the recoil

Cool the barrel down

This mechanism requires a power source, represented in this system by an ether capacitor installed in the buttstock of the rifle.

Equipment

Legacy is equipped with the following modules:

Bayonet-hook that lets the user fix the position of the rifle and may be used as a melee weapon.

Bipods

3 mage-optical sights that allow the user to accurately shoot at almost any distance from the target.

Heavy buttstock with the magical recoil dampener

Small ether capacitor

[wdeltag-eng]

Interdimensional Transport of Omega Timeline

Name

Voider

Description

Voider is a type of transportational vehicles that is capable of safe travel through the interdimensional Void.

Voiders were invented in Omega Timeline, under the Council X's guidance.

Voiders were meant for flights between the Timelines, Worlds and Universes.

General properties

Average dimensions

15×5×4 for the fuselage, 7.5×0.5×3 for the wings - in meters.

50×15×12.5, 25×1.5×10 - in feet.

Appearance

There are many different types of Voiders, but most of the time they have an elongated, flattened on its ends, fuselage, with wide wings.

Cockpit

Open Cockpit is made of glass and extends beyond the fuselage. Due to the lack of armor, such a cockpit uses most of the energy of the Voider's shields. However, it provides a better view for the pilot, while also allowing the use of magical, optical and electromagnetic observational devices.

Closed Cockpit is located inside of the fuselage. The smaller the cockpit and the deeper it is inside the fuselage, the more protection can be provided to the pilot. Due to the lack of a direct view, the pilot has to rely entirely on observational devices.

Plating

The Voider plating is always dark purple, because it consists of Voidan, an enchanted composite material consisting of layers of Nitinol (nickel-titanium alloy that has shape memory), Unicum (high-strength gold-nickel-copper alloy), high-carbon chromium-vanadium steel, and also copper vacuum nano-tubes. The structure of this material and the magic used in it, allow it to withstand the destructive effects of the Void.

Structural elements

Voiders consist of different structural elements that have their own purposes.

Cockpit is the mainframe of the Voider. The controls for every and each system on the board are here.

Tech Unit is a place where all of the most important elements of the Voider are gathered. Energy Sources, Info-Mass Converters, ID-Portal tech, Shield Generators, Software, etc.

Engine is a thrust unit that allows the Voider to move in space. If a special fuel is needed, it may be contained in the same segment as the Engine or in a Tech Unit.

Weapons Bay is a place that contains the weaponry of the Voider, including its ammunition.

Storage Unit is a place that contains the cargo that the Voider may carry, including the landing troops.

Radiator is an active cooling system that works in two modes, depending on the environment. In the atmosphere, radiators use convection, but in the vacuum they switch to use the irradiation.

Armor Unit is an armored segment.

Classification

Every model of any structural element of the Voiders has its own name that describes its purposes, version and main functions.

Purpose

Abbreviation that describes main characteristics of the model. Most of the time consists of the first letters of words used in the name of the structural element.

Example:

IDTS-E - Impulse-Diffusion Thermonuclear Synthesis Engine

Version

Numeric or literal value that describes the progress that was achieved by the developers of the structural element while updating the old versions or creating a new technology.

Version is written in arabic numerals if it's just an updated version with unnoticeable(most of the time) changes in the technology.

Version is written in roman numerals if the amount of symbols in it is less or equal to the amount of symbols in the arabic number.

Version is written in greek letters if the version has some properties that stand out of the rest.

α - Alpha - First Version.

Ω - Omega - Last Version.

Δ - Delta - Description of a generation which the version was developed in. With every new generation, Δ gets marked with a corresponding number. Versions can be counted from the first generation but most of the time the counter resets every time the new generation gets developed(Δ gets marked in this example). Version Δ replaces versions α and Ω for separate generations. Nevertheless, Δ1 can't be used instead of α.

Σ - Sigma - Version that is significantly Changed, Unstable, Experimental or isn't Tested thoroughly.

Ξ - Xe - Version that uses technology that was invented in another universe and is undeveloped in Omega Timeline.

δ and γ - Beta and Gamma - Optional prefixes. They are written before the version numbers. β - Underpowered version. γ - Overpowered version.

* - Asterisk - Optional postfix. It is written after the version numbers. Asterisk means that the model was fine-tuned. The changes are very small, almost undetectable.

Prefixes and postfixes may be used together, but only to some extent. Using Σ would be much more preferable.

Examples:

6 - Version 6

L - Version 50

Δ7-87 - Gen 7, Version 87 - (let's say that other generations had 100 versions each) Version 787

βα - Underpowered Version 1

Ω* - Last Version, Fine-tuned

Standart Configurations

Configurations split the space inside of the Voider into segments which contain structural elements. The more there are segments, the less there is space for each. That decreases the efficiency of configuration. Abundance of free space is harmful for the efficiency, too. The need for balance of space inside of the Voider led to the invention of standart configurations for the Voiders of specific types.

TriSeg-HV

Triple Segment - High-Velocity

Configuration that is mostly used in the structure of Light-class scouts, interceptors or bombers. Constructional decisions let the dimensions and weight of the craft to shrink, and that positively affects overall maneuverability. That configuration is the only one which sets the preferred energy source as a capacitor, not a reactor. That is caused by a lack of radiational shielding that protects pilots and crew from reactor's radiation(not every reactor emits radiation though).

Segment 1/3 - Open Cockpit

Segment 2/3 - Tech Unit with the reactor / capacitor and the additional devices.

Segment 3/3 - Engine / Weapons Bay

Wings(Segment 2/3) - Weapons Bays / Radiators / Engines

Example:

Name: Visionary

Model: HVSS-12* - High-Velocity Stealth Scout, 12, Fine-tuned

Description: Stealth scout with no weapon systems that is used for short flights. Uses TriSeg-HV.

Segment 1/3 - Open Cockpit

Segment 2/3 - Tech Unit with a condenced ether capacitor CEC-Δ9 and stealth device SDME-γΔ3-76

Segment 3/3 - Kinetic repulsion magical-energy engine KRME-E-ΔX-C

Wings(Segment 2/3) - Kinetic repulsion magical-energy engines KRME-E-βΔX-C, radiators

QuadSeg

Quadruple Segment

Most popular configuration for every type of Voiders. This structure is always multi-role, giving the pilot enough firepower, speed, maneuverability and function.

Segment 1/4 - Open / Closed Cockpit

Segment 2/4 - Weapons Bay / Storage Unit

Segment 3/4 - Tech Unit with the reactor and the additional devices

Segment 4/4 - Engine / Weapons Bay / Storage Unit

Wings:

Segment 2/4 - Weapons Bays(double/single) / Engines(double/single) / Radiators(double/single)

Segment 3/4 - Weapons Bays(double/single) / Engines(double/single) / Radiators(double/single)

Example:

Name: High-Tower

Model: AVDC-Ω - Anti-Voider Defense Complex, Last Version

Description: Heavy-class fighter that is used to destroy Light- and Middle-class Voiders. Uses QuadSeg.

Segment 1/4 - Closed Cockpit

Segment 2/4 - Kinetic magical-energy railgun turret KME-RGT-ΔXI-52

Segment 3/4 - Tech Unit with magical-magnetic cold thermonuclear synthesis reactor MCTS-R-ΔV-CLX* and the Core EtMTD-Δ7-XC

Segment 4/4 - Kinetic magical-energy railgun turret KME-RGT-ΔXI-52

Wings:

Segment 2/4 - Magical-energy missile launchers ME-ML-Σ

Segment 3/4 - Impulse-diffusion thermonuclear synthesis engines IDTS-E-Δ9-88

PentaSeg-HP

Pentuple Segment - High-Power

Configuration that was made specifically for SuperHeavy-class fighters, Heavy-class bombers or Light-class cruisers. Firepower and defenses are maximized.

Segment 1/5 - Weapons Bay / Additional Tech Unit with a Shielding Device / Armor Unit

Segment 2/5 - Closed Cockpit

Segment 3/5 - Weapons Bay / Storage Unit

Segment 4/5 - Tech Unit with the reactor and the additional devices

Segment 5/5 - Weapons Bay / Engine

Wings:

Segment 2/5 - Weapons Bays(double/single) / Armor Units

Segment 3/5 - Weapons Bays(double) / Engines(double) / Radiators

Segment 4/5 - Engines(double/single)

Example:

Name: Rampage

Model: Elite Model

Description: Elite Light-class cruiser that is painted in a color of bright blood and uses PentaSeg-HP. This one took some hits. It is the one of the most old Voiders ever used by Omega Timeline, but specifically this model is equipped with all of the newest technology. Rampage gets updated every time the new tech gets developed. This makes it one of the most honored and dangerous ships of Omega Timeline. Differs from the other Voiders with extremely short and wide wings. Rampage is owned by Epsilon from the Council X.

Segment 1/5 - Magical-Energy Plasma-Kinetic Ram

Segment 2/5 - Closed Cockpit with the Inertial Compensators

Segment 3/5 - Anti-matter missile turret AMAW-MT-Δ2

Segment 4/5 - Tech Unit with anti-matter reactor AMR-Δ2 and the Core EtMTD-Δ8

Segment 5/5 - Impulse-diffusion anti-matter engine IDAM-E-Δ2

Wings:

Segment 2/5 - Armor Units

Segment 3,4/5 - Impulse-diffusion anti-matter engine IDAM-E-Δ2

[wdeltag-eng]

What Omega was at first

Ink(original by myebi) created Omega Timeline(original by dokudoki). Before, it was one of the most stable timelines of the Original Universe.

When creating Omega, Ink used the same trick he used much earlier, when he created the First Alternative Universe - Aftertale(original by loverofpiggies). He disconnected the timeline from the Original Universe and moved it outside the universe.

Ink intervened in the story, made a truce between Humans and the Monsters, and created the Democratic World State.

The universe that came out after these actions was used by Ink as a shelter for the people, who survived after the attacks of Error(original by loverofpiggies).

After Ink found, befriended and recruited Core(original Core!Frisk by dokudoki), Omega Timeline started to fill up not only with the survivors but with the unique locations which weren't damaged by Error, too.

Ink's Political System

The Democratic World State was a very conservative capitalistic democracy.

Because of the conditions that were present in Omega Timeline, the scientific progress wasn't making almost no impact on the society for a very long time. There weren't any wars, so no real needs for the resources. The whole universe was literally just a shelter, and that caused its inhabitants to not feel like they actually needed to progress somewhere.

Early"-ish" History

Ink created Omega Timeline around 15.000 years ago, after Eraser(Error) got corrupted and attacked their first victims.

Omega Timeline slowly grew the first 10.000 years, sheltering more and more people and containing unique locations from the different universes. Omega was fully hidden from all of the hostile forces in this period of time. The only purposes it served were sheltering the survivors and being an operational base for Ink, since the Doodle Sphere is located inside of the Omega.

X Event(original XTale and Underverse by Jakei), the most impactful event for the whole multiverse, that happened around 5.000 years ago, made the characters from XTale travel to Omega Timeline, where they became the Council X, the main governmental body of Omega Timeline ever since.

The Council X

X!Asgore

Kai - Kaiser

Legislation and the Domestic Policy of Omega Timeline.

---

X!Toriel

Alcy - Halcyon

Legislation and the Foreign Policy of Omega Timeline.

---

X!Asriel

Hope

The Judicial System. Domestic and Foreign Policies of Omega Timeline.

---

X!Chara

Psi - Epsilon

The Demon Hunter. Psi is an actual celebrity in Omega Timeline.

---

X!Sans

Cross

Emergency Minister. Admiral of the Military of Omega Timeline.

---

X!Papyrus

Guard - Guardian

Emergency Minister. Admiral of the Military of Omega Timeline.

---

X!Alphys

Mono - Monochrome

Science Minister. Head of the Lab Omega. Head of the Department of Soulogy in the Lab Omega.

---

X!Undyne

Gall - Gallant

Combat Tactics Minister. High Admiral of the Military of Omega Timeline.

---

X!Mettaton

XMTT

Combat Tactics Minister. Science Minister. Head of the Department of Weaponry in the Lab Omega. Admiral of the Military of Omega Timeline.

---

X!Muffet

Insy - Insurrect

Public Minister.

Council X's Political System

Immediately after the coming of the Council of X to power, the old regime was completely removed and reformed into a centrist parliamentary monarchy with the Council X in the roles of the monarch and the parliament at the same time.

The currency was cancelled, and the entire production infrastructure was transferred to the ownership of the state.

All citizens are equal in rights, except for the military and scientists.

If a Human or a Monster serves (or has served) in the Military of Omega Timeline, they have the access to arsenals and hangars with military equipment. The only restrictions on possible equipment are qualifications and rank.

If a Human or a Monster works in the Lab Omega, they have the access to the departments of the Lab that study the scientific branches in which the scientist is qualified, as well as to documents of the level corresponding to the level of the scientist's qualifications, and the instruments and materials necessary for conducting studies.

History after the X Event

With the guiding hand of the Council X, the scientific progress immediately went through the roof. There were created some very complicated things, like vehicles, capable of safe travel through the interdimensional Void, advanced magical-energy weapons and defense systems, and hi-tech elements of the different branches of the infrastructure.

The entire solar system was colonized.

Extraction of resources from asteroids has been successfully started.

Hundreds of various satellites have been launched into the orbits of the planets.

A Dyson sphere was built around the Sun.

An interdimensional artillery system - the BFG - was built near the Earth.

Over the course of ~5000 years, Omega Timeline has been turned into a military state, the purposes of which were the resistance against the expansion of the influence of forces that were hostile to Omega, and protection of the multiverse.

[wdeltag-eng]

Light-Class Paired Pulsars* Elite Model "Clockworks"

"Clockworks" were lost in a battle "SGF0cmVk_20U145". General Lloyd and their sister Gailheit went missing along with the prototype.

This model is the first successful prototype of the new kind of weapons for personal use - Light-Class Paired Pulsars. These submachine guns were developed using the most sophisticated Condensed Ether technology that was ever developed in Omega Timeline. Ether capacitors that were built in the system could hold enough energy to shoot for quite a long time. After all the energy is used up, "Clockworks" automatically switch to an alternate firing mode - Continuum. In this mode "Clockworks" absorb the ether from the environment and compress it during firing, allowing them to shoot even more but sacrificing the damage of each shot. Continuum can be triggered on and off at any time.

* Pulsars are a type of energy-magical weapons that use magic beams to deliver energy. They were invented in the Omega Timeline.

[wdeltag-eng]

Kinetic Energy-Magical Sniper Railgun* KR-LV** "Karma"

That weapon is used only against the most dangerous, violent and serious enemies.

Without the modifications in the software of the on-board computer, you have to lock on the target and let the computer correct the position of the weapon before you shoot. That's necessary because this weapon is primarily used on tremendously long distances and even the smallest mistake could make the bullet miss the target.

Standart configuration: Length: 175 cm \ 69 in. (nice) Mass: 10 kg \ 22 lbs. Caliber: 15х100 mm \ .60 RG Bullet speed: 2500 m/s \ 5500 mph Max theoretical shooting range: 25 km \ 15 miles Clip capacity: 3 bullets, 2 MJ

Standart modules: On-board computer 64x adjustable sniper scope Subspace kinetic bipods, controlled by the on-board computer(4 pieces) Heavy stock with the built-in recoil compensator

Ammo types: Kinetic(K) Armor-Piercing, Capped, Ballistic Cap(APCBC) High-Explosive(HE) Magical Explosive(ME) High-Explosive Armor-Piercing(HEAP) Magical Armor-Piercing(MAP) EMP-Plasma(EMPP) Magical Plasma(MPW) Project "Comet"(MIPT) Project "Radiant"(EDPW) Project "ERASE"(AMAW)

* Kinetic Energy-Magical Sniper Railgun - a type of the sniper railguns that uses telekinesis to accelerate the bullets. * KR-LV - Kinetic Railgun 55. Acronym "KR" means "Karmic Retribution". Acronym "LV" means "Level of Violence". Together they mean "Karmic Retribution for your Level of Violence".

[wdeltag-eng]

Do you have an explanation for soul absourbing? And what are the names for the secondary souls (I loved your explanation for the souls and the bases alongside the multiverse)

Soul Absorption

Soul Absorption is a process that is pretty similar to the Soul Fusion, even though the differences between them are massive. When one Soul starts to Absorb the other, it overpowers the other Soul's Mind and disables it. Then the Soul starts to suck the Bases out of the other one and stores them in itself. These stored Bases can't be in the Soul forever though. They're not related to the Soul's Mind and soon get their energy spent(hence the ultimate power level for the short time after the absorption). Then the unrelated Bases get rebuilt or broken down to the Elements, becoming a full part of the Soul. After the Absorption, the Soul becomes more powerful for the whole lifespan(though that lifespan may be shortened by the resistance of the absorbed Soul).

Secondary Bases

The names of the Secondary Bases depend on what those Bases made of. For example, Determination and Perseverance make up the Will. Justice and Kindness are the components of the Mercifulness. And so on.

[wdeltag-eng]

Assault Pulsar, model AP-EX "RAM"

Standard configuration:

Beam energy: 2.5-7.5 kJ

Beam energy delivery rate: 25 kJ/sec

Energy capacity: 75 kJ(10-30 shots)

Rate of fire: 10 shots/sec

Energy-magical underbarrel bayonet energy: 15 kJ(5 uses)

Bayonet energy delivery rate: 3 kJ/sec

Standard modules:

An energy-magical underbarrel bayonet.

High precision holographic sights with an automatic rangefinder.

A subspace medium stock.

A subspace underbarrel grip.

* Pulsars are a type of energy-magical weapons that use magic beams to deliver energy. They were invented in the Omega Timeline.

* AP-EX - Assault Pulsar E-10. And just apex.

[wdeltag-eng]

The Soulogy

Introduction

Souls are strange and unusual things. But they work. They give life to every creature in the universe, and the Soulogy was created to explain how they work.

Terms

The Void is called the Ether. It is the Void that is the reality itself, because only in it can energy take physical form. Energy tends to do this, because matter is much more stable. It is less susceptible to chaotic influences and, although unable to live forever, is the preferred mode of existence.

The Anti-Void is the Pure Ether. The Anti-Void holds an almost infinite supply of energy, which is unable to transform into a stable physical form due to the energy overload inside the bubble of Pure Ether.

The Soulogy is the science of Souls in general. The Soul is a too broad concept, so Soulogy has many branches of research.

The Elementary Soulogy is the science that studies Elements and their properties. Not a very large field for research. Only scientists from Underlust (by AU community) were able to extract some benefit from Elementary Soulogy.

The Elements are particles that are created from Light, with slightly altered properties. There are three types of elements: Faith, Hope, and Love.

The Basic Soulogy is the science that studies the Bases. A much broader science that provides the researcher with many years of work. 

The Bases are particles that are created from Elements. In each Base, the proportions of the Elements are different, and the properties of the Base itself are strongly dependent on these proportions. The Bases are created in a part of the Soul that is called the Mind.

The Organic Soulogy is the science that studies the processes that take place in each individual part of the Soul, as well as the mechanisms that allow these processes to take place.

Creation of the Multiverse

Before you can gain a full understanding of what Soulogy is, you need to know how the multiverse works and what mechanisms allowed this science to be formed.

Since the beginning of history the Multiverse has been one, whole. It was empty, without a single island of matter or energy, but it was one. UnderFill was Balanced. Light and Darkness, the omnipresent primordial elements, raging and fighting against each other in other worlds, for lack of any other choice had united in an infinite whole that is the Balance. It is not known how much time passed like this, it is even possible that the Ether was in this state forever but one day everything changed.

In one blink of an eye the Balance simply ceased to exist. The violent impact divided each "molecule" of Balance into two tiny particles of being, the Light and the Darkness. Where did this furious blow come from? From the Pure Ether.

The bubble of the Pure Ether has merged with our Ether, and the energy from there began to flow into the Void, which could now support the existence of life due to the destruction of the original(dead) Balance. At first this energy was spent on creating the universe and life in it, and the channel through which this energy went was one. But when life was fully formed, more and more small channels began to open, piercing through reality and drawing energy from the Pure Ether. These smaller channels became Souls.

The Elementary Soulogy

Souls, exactly like the universe that was created immediately after the destruction of the Balance, are entirely made up of Light. Though for the correct appearance in the physical world it was necessary to change the form of Light, and in the Souls it was divided into three parts: Faith, Hope and Love.

These three components are called Elements and have their own properties that differ from the properties of Light: 

Faith is responsible for the connection with the Ether and allows you to more effectively transfer energy from the Pure Ether to the ordinary one. 

Hope gives stability and vitality.

Love is the catalyst between Hope and Faith and when the Soul is damaged it can break down into the right amount of these Elements.

The Elements themselves, under the influence of the Mind, combine in different proportions, creating combinations.

The Basic Soulogy

These combinations became the basis of the physical appearance of the Soul and received the appropriate name - the Bases. The Bases have their own classification. They are divided into Main, Secondary and Rare.

The Main Bases are the same seven that we know from the Original Story: Determination, Bravery, Justice, Kindness, Patience, Integrity and Perseverance. These Bases are called the Main because of their properties. It is these seven Bases that are the most stable and effective of all possible, so their formation is more preferable than the formation of Secondary or Rare Bases.

The Secondary Bases are the ones formed when several Main Bases are combined. Secondary Bases have less powerful special features but in return provide more room for energy. For example, if you combine Determination and Perseverance, you get the Will, a Secondary Base that has less of the special features but more energy capacity. If you mix all the seven Main Bases, you will get a Base that goes beyond the ordinary classification - Magic. Magic doesn't have any features at all but its energy capacity is incredible. The more Magic a creature has in its Soul, the more energy that creature can store and use.

The Rare Bases are the ones that are not formed as a result of magical evolution, as happened with the Main Bases, and not as a result of mixing, as it works with the Secondary Ones. Rare Bases are formed due to random mutations, errors in the code, or manual manipulation of any Bases or their Elements. Almost every Rare Base has exceptional properties. For example, the Base of Faith, which is the only component of X!Gaster's Soul. In the UnderFill(and only there!!!) it is what X!Gaster used to manipulate his universe. Or the Base of Fear, created by Agate Lightvale in Glitchtale(by Camila Cuevas).

Also, in the Soul, depending on the internal conditions and the influence of the Mind, the Bases may have different properties. The Mind is able to create several forms of resonance that affect certain Elements of the Bases, which changes their behavior. At the energy resonance of Hope, the Base forms a crystal structure, which greatly increases the strength, hardness and density of the area in which this Base is located. While the Base is crystallised, it has very low properties. The crystals of the Bases are practically incapable of storing and transmitting energy. With the energy resonance of Faith, the Base, on the contrary, acquires a more rarefied structure. This increases the overall properties of the Base, although greatly reduces the stability. Love, being subjected to an energy resonance, begins to decay into Hope and Faith. These resonances cannot differentiate and, for example, cancel each other out. Often energy resonances are used in pairs: the "Hope-Love" resonance greatly increases protection and regeneration, and "Faith-Love" allows you to use energy as efficiently as possible.

The Organic Soulogy

The Soul is a concentration of energy, literally a battery, necessary for life of any being. The Soul is a battery, not a generator. It is incapable of generating energy on its own, just as nothing else can. All the energy used in the Soul is coming directly from the Pure Ether.

The Soul consists of several parts: the Core, the Mind, and the Shell.

The Core is the main part of the Soul. It is the Core that crosses the boundary of reality, allowing the Soul to receive energy from the Pure Ether. The core cannot be created artificially, because ordinary technology and magic can not punch a hole between the Ether and the Pure Ether. It is formed only in the process of forming a new Soul, and immediately self-destructs when you try to extract it. This is due to the fact that without the guidance of the Mind, the Core begins to conduct through itself as much energy as possible, and can not withstand such a strong flow. As a result, the core instantly burns out.

The mind is the part of the Soul that is responsible for any processes that occur within it. The mind is responsible for:

Regulation of the energy flow transmitted by the Core.

Irradiation of the Elements, and their transformation into Bases.

Creating certain configurations that allow energy to take physical form(in other words, spells, but more about this in another post).

Formation of personality(including gender, character, habits, etc.)

Transmission of genetic and magical information during reproduction by Soul Fusion

A few other smaller features.

The Shell is the external part of the Soul, consisting of Crystallised Bases. It is responsible for the protection of the Soul and grows gradually, along with the Soul's formation. The closer the Shell layer is to the outer part of the Soul, the older it is. This allows you to learn the early composition of the Soul, as well as to record changes in this composition, which allowed to study the functions of the Mind so well. When the Shell is damaged, new Bases immediately fall into damaged place and heal the damage.

Souls have a mechanism of reproduction based on a combination of gene-magical information from two or more parents. This mechanism begins to work when several souls come into physical contact. First, the crystal shell of each of the Souls is liquefied, then they merge together. The gender identity of the Soul is very important in this process. The gene-magical information is absorbed by the very Soul that, when it came into contact, had the most "feminine" gender. This happens because the more "feminine" Soul's gender is, the more friendly is the environment for a subsidiary Soul's proto-form. When the absorption of information is completed, the Minds untangle and the Souls separate(in some cases, the separation may go wrong and the composition of the Souls may be mixed. The mind in such cases suffers very rarely, but its damage is also possible), and, in the end, the shells crystallize again. When the process of Soul Fusion is fully completed, in the Soul that absorbed the gene-magical information begins the process of Incubation. The gene-magical information begins to combine in a special sequence and, after a while, a subsidiary Mind is formed right in the parental Soul, separated from it by an early version of a Shell(it's more of a membrane than a shell on this step). At first, it uses the energy that he receives from the parental Soul but soon begins to separate from it. It is at this time that the Core is being formed. When the Core is fully formed, the separation process ends, forming a whole new Soul.