The Dimensional Rifts

The Dimensional Rifts are multiple different rips in reality, caused by the fall of Th'nath after the Battle of the Maelstrom.

Chaos Realm
The Chaos Realm is a destructive realm somewhere within the dark beyond, inhabited by the remainder of The Herium; a faction of demons separate from the Burning Legion. This realm once belonged to one of the last peaceful nations of un-corrupt Annihilan, who were all either corrupted or merely slaughtered during The Herium's arrival.

Blossom Realm
(to be added)

Barren Realm (Kalidar)
The Barren Realm is a strange pocket of existence located somewhere around the skies of Azeroth. It largely resembles a huge floating rock, with two large crater-like areas on the top. Currently, nobody really knows how to get on (or off) of it, but various different creatures that seemingly went missing after The Reshaping have ended up here. The orcs named this place 'Kalidar', and seem to be keen to wipe the Alliance off the face of it. Yet, not everything seems right here...