Board Thread:Warhammer 40k General Discussion/@comment-25618639-20150712020502/@comment-6078851-20150712105512

emps seems to have been the perfect human from birth - as cch123 points out: emps' genome was massively altered in-utero (not technically by emps' persona but by the collective shaman psyche), and he was 8,000 years old before genetic modification became a science, so he probably knew by then that he wouldn't have needed any artificial augmentation.

it's possible that he did some genetic tinkering on himself in preparation for the thunder warriors, custodians, primarchs etc - although it's more likely that he worked on extracted samples of himself rather than alter his own being. however, if he did work on himself then it definitely wasn't adding perpetuality, because if he did then he would've known for a fact that he was a perpetual and wouldn't have needed the life-sustaining properties of the golden throne. emps was, apparently, ageless, and could recover from injuries very quickly, but he also knew that he wasn't truly immortal, hence why he was so insistent on being hooked-up to the throne's life-support.

emps also thought quite highly of himself, and quite rightly too :P, so i doubt he ever gave serious consideration to genetically altering his own body.