Board Thread:Warhammer 40k General Discussion/@comment-25618639-20141119150740/@comment-24944355-20141229223942

If the Emperor was a perpetual he would have let himself die after the battle with Horus knowing he would come back to life whole & hale within minutes & the whole trapped in the golden throne thing would never need to have happened.

Also as I have stated before Emps is far to powerful now, his spirit has grown to such a level of potency that he is without doubt a god & gods can't manifest themselves on the material plane. It is only the golden throne that's keeping the Emperor incarnate if he was removed, even if fully healed, his spirit would burn out his body in moments. It's likely that it's his burgeoning spirit that is causing the golden throne to begin to fail, he has simply grown to powerful for even the throne to contain.