Lore

I don't know or have an opinion on everything lore-wise that might come up in my game, so I default to the rule books and the Forgotten Realms, which is kind of the default D&D setting. But once I've had a chance to think about something I generally do have my own idea of what it should be, which differs slightly from the default (e.g. I see dragons as symbolizing primordial chaos and danger, so there are no lawful dragons in my world).

I use largely the same set of planes as default D&D: a prime material plane called Rojopotis, surrounded by the elemental planes and lesser material planes, all enclosed in the Astral Sea beyond which lie the spiritual (non-material) Outer Planes.

The gods in my game are fairly standard, a plethora of gods of different strengths, focuses, and alignments, now mostly distant from the material planes. Other powerful forces include powers, archetypal forces that created the gods; saints, souls of the dead empowered by gods; celestials and fiends, the original, timeless beings that inhabit the Outer Planes; and of course Elder Gods, incomprehensible aliens that invade creation.

Cosmology