In the same campaign as the Inheritors, I had only 3 species of “Elves”- the Asteraiinen, the Svartolaiinen, and the Vertolainen.
The Asterainen were the ones who were most closely attuned to magic, and lived “beyond the stars” in a pocket reality similar to the time and space warping legends of Underhill.
The Vertolainen used their magic to fuse their forms with aspects from trees and other plants. They photosynthesize for most, but not all of their food, and live in cunningly engineered crystalline biodomes near the surface in partnership with The Inheritors.
The Svartolainen were the setting’s version of the Drow, driven underground to escape the ravages of the aftermath, using their magic to attune themselves better to the hazards of the Underdark.