"That may be the fault of the creatures who first used the warp for evil. During my galaxies war in heaven, your galaxy was dominated by vile Xenos called the Rakata, and they are the origin of the twisted variation of your immaterial master you so openly name."
"No empire would fare well under Xenos Control, the Aeldari have shown that well enough, and the Necrontyre demonstrate that it takes xenos enslavement to keep xenos empires alive."
He is merged with a fragment of the emperors psychic might. (This was done by the mun to avoid the worry that someone kills bro before he's even finished, or his story is done)