Board Thread:Warhammer 40k General Discussion/@comment-7186329-20130329201743/@comment-3580035-20130423085852

Ahhh, there I believe you are wrong. There are many things in Warhammer 40k that can destroy stars, mostly weapons that every major race basically possess (heck, even Tau have accidentally blown up stars). The Celestial Orrery was described in the Necron 5th Ed codex, and this, I believe, was written after the Uriel Ventris series finished. And it isn't something that is small and easy to break. Its a vast array that fills an entire hollow planet, and blowing it up basically does blow up the galaxy. Ergo, it isn't what Uriel destroyed and he blew up something different.

As for its potential use, you'll have a hard time getting the Necrons to cooperate with anybody. They don't have the patience for lesser species to mess around with it, and using it to just blow up Tyranids "upsets the fundamental forces of the galaxy, setting of a catastrophic chain reaction" (quote). It then takes "many thousands of years of constant and precise micromanagement" (another quote) to fix any premature detonations.