#thirdtofifth monstrosity

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The displacer beast pack lord! An upgraded, huge-sized version of the displacer beast, the leader of a pack and the patriarch of an entire bloodline of the dreadful creatures. Seeing as 5e's 2024 Monster Manual introduced the primeval owlbear, it seemed like high time to bring back the pack lord from the original 3.5e Monster Manual.

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Can you please do the Zezir? That weird fire raptor that I never remember how to spell right.

Zezir Medium monstrosity, chaotic evil Armor Class 16 (natural armor) Hit Points 127 (15d8 + 60) Speed 40 ft. Str 18, Dex 18, Con 19, Int 5, Wis 12, Cha 13 Damage Immunities fire Damage Vulnerabilities cold Senses darkvision 60 ft. passive Perception 11 Languages - Challenge 6 (2300 XP) Fast Healing. The zezir regains 10 hit points at the start of its turn if it has at least 1 hit point. If the zezir takes cold damage, this trait doesn't function at the start of the zezir's next turn. Actions Multiattack. The zezir makes three attacks: one with its bite and two with its claws. Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8+4) piercing damage. Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6+4) slashing damage. Spark Spit. Ranged Weapon Attack: +7 to hit, range 30/60 ft., one target. Hit: 14 (3d6+4) fire damage. Flammable Spray (Recharge 5-6). The zezir spits a sticky flammable goo in a 30-foot cone. Each creature in that area must make a DC 15 Dexterity saving throw, taking 17 (5d6) fire damage on a failed save, or half as much damage on a successful one. The area continues burning for 1 minute, and any creature that starts its turn in the area during that time takes 3 (1d6) fire damage.

The zezir is a creature of the desert, hunting alone or in packs of three to eight. They delight in fire, and often will attack caravans just for the joy of watching them burn. They are pyromaniacs to the core, and the fact that they prefer to feed on ash, and seem to gain sustenance from it, only adds to their obsession. Zezirs communicate in yips and growls. They appear reptilian, but actually are closer to being avian. They stand 5 to 5-1/2 feet tall and weigh around 150 pounds.

Originally from the Monster Manual III. A request from androidmk1.

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Protean Scourge Medium monstrosity (shapechanger), neutral evil Armor Class 17 (natural armor) Hit Points 161 (19d8 + 76) Speed 40 ft., climb 10 ft. Str 20, Dex 17, Con 19, Int 14, Wis 14, Cha 19 Damage Immunities poison Damage Resistances cold, lightning; bludgeoning, piercing, and slashing from nonmagical attacks that aren't silvered Condition Immunities petrified, poisoned Senses darkvision 60 ft. passive Perception 12 Languages Abyssal, Common, Infernal Challenge 12 (8400 XP) Magic Resistance. The protean scourge has advantage on saving throws against spells and other magical effects. Shapechanger. The protean scourge can use its action to polymorph into a Small or Medium humanoid, or back into its true form. Its statistics, other than its size, are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies. Spellcasting. The protean scourge is a 8th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 16, +8 to hit with spell attacks). The protean scourge has the following sorcerer spells prepared: Cantrips (at will): dancing lights, mage hand, prestidigitation 1st level (4 slots): charm person, color spray, mage armor 2nd level (3 slots): mirror image, scorching ray, spider climb 3rd level (3 slots): blink, haste 4th level (2 slots): greater invisibility Actions Multiattack. The protean scourge makes either two attacks with its claws and one attack with its gore; or three attacks with its scythe and one attack with its gore. Claws. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 9 (1d8+5) slashing damage. Gore. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 16 (2d10+5) piercing damage. If the target is a Large or smaller creature, it must succeed on a DC 17 Strength saving throw or be knocked prone. Scythe. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 12 (2d6+5) slashing damage. Reactions Split. When the protean scourge is subjected to damage, it splits into two new protean scourges if it has at least 10 hit points. Each new protean scourge has hit points equal to half the original protean scourge's, rounded down. Each new protean scourge can cast spells, but they share a pool of spells per day as if they were one creature. The two protean scourges can recombine in a process that takes one minute and requires both protean scourges to be within 5 feet of each other. The separate protean scourges are incapacitated while recombining, and only two protean scourges who were originally separated from each other can recombine.

These deadly shapechanging assassins are often mistaken for denizens of the Abyss. With abnormally-long legs and pebbly red skin, the confusion is understandable. They love killing above all else, and seek out opportunities to do so, happily submitting to the service of evil warlords and the like to sate their bloodlust. These thoroughly-cruel creatures stand around 7 feet tall and weigh 200 pounds.

Originally from the Monster Manual III

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Fhorge Large monstrosity (monstrosity), unaligned Armor Class 16 (natural armor) Hit Points 147 (14d10 + 70) Speed 40 ft. Str 24, Dex 10, Con 21, Int 2, Wis 15, Cha 10 Senses passive Perception 12 Languages - Challenge 9 (5000 XP) Charge. If the fhorge moves at least 20 feet straight toward a target and then hits it with a tusk attack on the same turn, the target takes an extra 24 (7d6) piercing damage. Keen Smell. The fhorge has advantage on Wisdom (Perception) checks that rely on smell. Relentless (Recharges After A Short Or Long Rest). If the fhorge takes 25 damage or less that would reduce it to 0 hit points, it is reduced to 1 hit point instead. Actions Bite. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 20 (3d8+7) piercing damage. If the target is a Large or smaller creature, it is grappled (escape DC 19). Until this grapple ends, the fhorge can't use its bite. Worry. One target grappled by the fhorge must succeed on a DC 19 Constitution saving throw or take 29 (5d8+7) bludgeoning damage and 29 (5d8+7) piercing damage.

These dread beasts roam the plains of the Outlands, finding food where they can. Some can be found on the more remote and exotic savannahs of the Material Plane, in herds of five to eight individuals. They can be quite aggressive if provoked. Fhorges stand around 5 feet tall at the shoulder and weigh almost 800 pounds.

Originally from the Fiend Folio.

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Chromanticore Large monstrosity, lawful evil Armor Class 14 (natural armor) Hit Points 102 (12d10 + 36) Speed 30 ft., fly 50 ft. Str 17, Dex 16, Con 17, Int 7, Wis 12, Cha 10 Senses darkvision 60 ft. passive Perception 11 Languages Common Challenge 5 (1800 XP) Tail Spike Regrowth. The chromanticore has twenty-four tail spikes. Used spikes regrow when the chromanticore finishes a long rest. Prismatic Hide. Whenever the chromanticore is hit by a melee attack from a creature within 5 feet of it, that creature takes 3 (1d6) damage from a type randomly chosen from among acid, cold, fire, lightning, poison, and thunder. If the attack was a critical hit, that creature must also succeed on a DC 14 Constitution saving throw or be blinded until the end of its next turn. Actions Multiattack. The chromanticore makes three attacks: one with its bite and two with its claws or three with its tail spikes. Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d8+3) damage. Claw. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 6 (1d6+3) thunder damage. Tail Spike. Ranged Weapon Attack: +6 to hit, range 100/200 ft., one target. Hit: 7 (1d8+3) damage. Prismatic Breath (Recharge 6). The chromanticore breathes multicolored energy in a 30-foot cone. Each creature in the area must make a DC 14 Dexterity saving throw, taking 21 (6d6) damage on a failed save, or half as much damage on a successful one. The damage type for each creature is randomly chosen from among acid, cold, fire, lightning, poison, and thunder.

Chromanticores are strange versions of manticores that have prismatic magic imbued in their bodies. Their origin is unknown. They are around the same size as normal manticores, but are noticeably tougher. Another creature from Magic the Gathering, the Theros block specifically, the chromanticore intrigued me as a monster concept, so I decided to break with my typical 3.5 monster conversions (again) to bring you this Magic the Gathering monster, statted up for D&D 5e. Don’t worry, more 3.5 conversions are on the way!

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Rat King Small monstrosity, unaligned Armor Class 14 Hit Points 112 (15d6 + 60) Speed 30 ft., climb 15 ft., swim 15 ft. Str 12, Dex 19, Con 18, Int 5, Wis 14, Cha 11 Condition Immunities charmed, frightened, paralyzed, petrified Senses darkvision 60 ft. passive Perception 12 Languages - Challenge 5 (1800 XP) Keen Smell. The rat king has advantage on Wisdom (Perception) checks that rely on smell. Speak With Rats. The rat king can communicate with normal rats (including giant rats). Actions Multiattack. The rat king makes five bite attacks. Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 6 (1d4+4) piercing damage. If the target is a creature, it must succeed on a DC 14 Constitution saving throw or contract a disease. Until the disease is cured, the target can't regain hit points except by magical means, and the target's hit point maximum decreases by 3 (1d6) every 24 hours. If the target's hit point maximum drops to 0 as a result of this disease, the target dies.

Sometimes, several rats, endlessly writing in the darkness and muck, end up with their tails entangled and eventually knotted together. Sometimes, when this happens, the pain and torment of their restrained existence causes the rats’ sentience to merge into one single creature. Thoroughly infested with disease, the sight of a rat king can be enough to send an entire city into panic for the illnesses it may spread. A rat king is about 3 feet tall and weighs around 15 pounds. 

Originally from the Pathfinder Bestiary 4.

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Nightmare Beast Huge monstrosity, chaotic evil Armor Class 17 (natural armor) Hit Points 202 (15d12 + 105) Speed 30 ft. Str 24, Dex 13, Con 25, Int 8, Wis 13, Cha 11 Saving Throws Dex +6, Con +12 Damage Resistances bludgeoning, piercing, and slashing from nonmagical attacks Condition Immunities frightened Senses darkvision 60 ft. passive Perception 11 Languages Abyssal Challenge 15 (13000 XP) Augmented Critical. The nightmare beast's weapon attacks score a critical hit on a roll of 19 or 20. Magic Resistance. The nightmare beast has advantage on saving throws against spells and other magical effects. Nightmares. Humanoids within 10 miles of the nightmare beast that need to sleep are plagued by constant nightmares and can't gain the benefits of a long rest while they remain in the area. Actions Multiattack. The nightmare beast makes four attacks: one with its tusks, one with its bite, and two with its claws. Bite. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 20 (3d8+7) piercing damage. Tusks. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 23 (3d10+7) piercing damage. Claws. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 17 (3d6+7) slashing damage. Dread Trample. The nightmare beast moves up to its speed. During this movement, it can move through the spaces of Large or smaller creatures. A creature whose space the nightmare beast enters for the first time on a turn must make a DC 20 Dexterity saving throw, taking 44 (8d10) bludgeoning damage on a failed save, or half as much damage on a successful one. At the end of this movement, it may make one attack with its tusks.

The nightmare beast is a terrifying creature with tough dark gray hide with blue, purple, and brown spots splattered across it. Its beady red eyes glow in the dark. The nightmare beast lives in a cave deep in the wastes, picking the region clean of prey before hibernating for a year or more. After awakening, it is often so ravenous that its hunting spree drives all civilized life out of its territory. The nightmare beast does not collect treasure; the only treasure that is usually found in its lair is that which it has eaten in its rush to consume its prey. A nightmare beast stands around 20 feet tall. Its weight is unknown.

Originally from the Monster Manual II

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Yuan-Ti Ignan Large monstrosity (yuan-ti), chaotic evil Armor Class 15 (natural armor, shield) Hit Points 104 (11d10 + 44) Speed 30 ft. Str 21, Dex 13, Con 18, Int 6, Wis 14, Cha 11 Skills Deception +3, Stealth +4 Damage Immunities fire Damage Resistances poison Damage Vulnerabilities cold Condition Immunities poisoned Senses darkvision 120 ft. passive Perception 12 Languages Abyssal, Common, Draconic Challenge 7 (2900 XP) Magic Resistance. The yuan-ti has advantage on saving throws against spells and other magical effects. Magic Weapons. The yuan-ti's weapon attacks are magical. Actions Multiattack. The yuan-ti makes four attacks: two with its mace, one with its gore, and one with its tail slap. Mace. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 12 (2d6+5) bludgeoning damage and 3 (1d6) fire damage. Gore. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 9 (1d8+5) piercing damage and 3 (1d6) fire damage. Tail Slap. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 10 (1d10+5) bludgeoning damage and 3 (1d6) fire. If the target is a Large or smaller creature, it is grappled (escape DC 16). Until this grapple ends, the target is restrained, the yuan-ti can't use its tail slap, and the target takes 15 (3d6+5) bludgeoning damage and 7 (2d6) fire damage at the start of each of the yuan-ti's turns.

The result of crossbreeding between yuan-ti and salamanders, yuan-ti ignans are aggressive and brutal, with an affinity for fire. They are rarely enountered without greater yuan-ti as their masters, who consider them to be expendable. Fear of insurrection causes yuan-ti leadership to keep ignans apart from each other until they are ready to be fielded in battle. Some yuan-ti fortresses have fallen to ignan uprisings, and are occupied solely by the creatures. They tend to keep gems and coins as treasure; never flammable items. Yuan-ti ignans range between 10 and 14 feet long and weigh 250 to 400 lbs. The males tend to have red scales, while the females tend to have gray or brown scales. 

Originally from the Monster Manual IV.