Board Thread:Warhammer 40k General Discussion/@comment-96.237.238.119-20131218020230/@comment-6078851-20140115153510

when emps dies the astronomican will fail, no probably about it: the astronomican isn't a device - as stated in the emperors page on this wiki the emperor is the source.

as for what happens to him after he dies - as we've been discussing elsewhere it seems most likely that he will resurrect himself, what with him being a perpetual (although there doesn't seem to be much information on that). so he won't become a warp god, and the starchild theory is even less likely (good, 'cause i've never liked that theory), he'll just 'wake up' the day after he dies, hearty and hale, and the stronomican will also come back 'on'.