Basically the nihallak figured how to turn their entire universe into their own version of Computronium thanks to High Plane energy, but turn out their Computronium suck in the fairy's universe, lol.
I could've wrote a book on this stuff, the original draft didn't even had room for pictures. I'm a nerd, and you might accidentally learn new stuff about Theoretical (And Fantasy) physics while ogling sexy fairies, sorry!