Originally posted by Fated Xtasy Hint: immortality gives one the ability to live forever, not be unaffected by dark powers of nihilus' caliber.
I'd suggest you go through this entire thread. I don't like repeating myself again and again. But I will give this one more try.
Emperor Vitiate achieved corporeal immortality, it increased his safeguard and granted him endless life. Emperor Vitiate fully understands the concept of Force Drain and himself is a master of this talent. He, however, focused on increasing his safe-guard against Force powers to ensure his survival, this is why he went to extreme lengths to achieve corporeal immortality. Force Drain cannot undo this.
Emperor Vitiate also converted some of minions to immortal beings and continuously drained them. This is additional proof that corporeal immortality cannot be undone by Force Drain.
In the nutshell, Emperor cannot be destroyed by Force Drain, be it from Nihilus or any other individual. This is why this is moot point in this contest.
Clear?