The Emperor and Perpetual Oll Persson on Themyscira.

A story challenge where Perpetual Oll Persson from Horus Heresy books "Know No Fear" and"Mark of Calth" talks to people in the 21st century/3rd millennium like John Oldman did in The Man from Earth movie.

Warhammer/Justice League challenge where Perpetual Oll Persson from Horus Heresy books "Know No Fear" and "Mark of Calth" and Vulkan end up in JL where Aresia killed off the male part of humanity.

Oll Persson has lived through most of human history, from Ancient Sumeria and Egypt, to the Great Crusade of the Imperium. He has seen and done so many things in his eternal life. But after his suicida mission to stall Horus he is sent to another dimension. Pairing not completely decided, but going with either Femshep or Samara. Rated T for right now, but might be bumped to M.

The Emperor of Mankind ends up in the JLA universe during the invasion while, unknown to himself, being reborn into the Star-Child. Yes, The Emperor is powerful in this story. But he will be weakened severely in some other parts. Pairings? I'm going with WW, but that depends on you readers, so vote. Yes, there will be challenges for GEOM, just wait and see.