The main reason I'm doing this is because I had this initial idea forever ago, and I mentally keep coming back to it over a few years.
The systems I chose where because I have some familiarity with those systems and I had an initial idea for how I could get them to fill specific facets of the mold. The settings I'm making will naturally be fairly small and constrained, partially by design and partially bc I want it to be. For those who want to know what the tentative mold is;
The Dragon Prince Roleplaying Game
Monsters (that which grants xp for killing)
Dragons (Found in the alternate realities of the Dragonmirrors)
Blights (sometimes causes undead)
Subterranean Insectile Race (Maintenance of the reality of the angle, what this entails and their behavior naturally changes between the angles)
Some form of hostile construct related to the warforged
Goblins (Probably going to be called something else) (Basically a bioengineered race designed for war, however, the exact nature is wildly different to one another. Always hermaphroditic)
Dragon-like or lizardman race
Elves (Connected to Elementals, Never found like this within the mirrors)
Arcane Humanoid Race (dreams of, sometimes sees or hears, the other angles, this race has the same appearance in every angle (like a mannequin), never found within the mirrors)
Positive and Negative energy locations
Ethereal/Astral/In-between locations
Elemental Ruins (factories of the constructs that still barely churn out warforged or ancient battlefields where magics still lingers)
Angels and Demons have been demoted to 'benevolent' and 'malevolent' spirits as appropriate
So, what little I have of lore is the following;
"The gods are dead. All that is left of the Primordials are but vestiges that infest That Which Remains. The World That Was was shattered in the great war between them. All that you see, the scarred worlds, the ruins, all of us who remain. So many of them focused on survival, making it through the turbulent times, that they have forgotten that there was a 'before'."
A great war between the divine, elemental lords, dragons, and mortals shattered The World That Was, it killed the gods, fractured the elements, and resulted in the dragons being trapped into alternate realities for their arcane energies.
The mortals 'won', but at the cost of their reality being splintered into numerous different adjacent realities, the rebuilding afterwards resulted in them, generally speaking, forgetting the cataclysmic war, instead being remembered as a sort of 'primordial chaos' origin myth.
Now, dragons are stored in a thing called a 'dragonmirror', these artifacts are what enables 'character progression' from a meta perspective. Should someone want a first level, they would need to go through one and slay a dragon of some variety, to gain higher levels (depending on the relative pattern I choose for each setting) they must slay stronger and stronger dragons. Within the mirrors are 'simulated realities', the sizes getting progressively larger, the simulations progressively more complex, and each reality tailored to the variety of dragon who is the target. They are killed in endless repetitions to fuel the growth and power of those who submit themselves to these trials.
I haven't thought super super hard on this as I just recently dedicated myself to actually working on this project. 'Goblins' are probably the random thing I thought of on the most.
Guess just posting this to toss it out, questions would be neat to get me to think on things, opinions would be neat I suppose.