Ynthalr
The Stream is governed by the Aspects, and each planet there is under their watchful eye. On one fateful day long ago, the Primordial Aspects grew tired of keeping the peace every single day, and created the Elemental Spirits to fufill that role. Afterwards, they went about taking a well earned nap, and haven't woken up since...
The Archviles of Fel soon took notice of their absence, and devised a plan to infiltrate and occupy the Stream. Their endgame is to merge multiple planets to create 'Ynthalr,' with one of the planets acting as a gate between Fel and the Stream. However, this proved to be much more complicated than they anticipated...