World-building for #dndnext again, in #13thAge style!

So 13th Age, as you may have read, revolutionized my way of looking at fantasy settings and cooperative storytelling within them.

The concept of Icons intended as powers that have clear (or murky, but definedly so) relationships with each other, and with which the player characters can have in their turn defined relationships with, kind of stated the obvious about world-building, but in a "why haven't I thought it before" kind of way.

My own "infinite project" named World of Cthon started as an alternative cosmology for D&D. The key idea was putting all the planes of existence inside a single material world, with defined spatial and temporal relationships with each other. That is to say: Heaven is a place on earth. And Hell too.
Such a "pocket-size" cosmology naturally implies an "assumed setting". That is, it's not just a guideline regarding planes, but it strongly suggests a story, and stories have characters.
The most influential of these characters are the three major families of gods of Cthon, that are beings sometimes defined as godly, sometimes not, throughout the whole history of D&D (if keeping the original D&D flavor).
In what I wanted to be a heads-up to real anthropology, the three families of gods represent/define three periods of time.