Pandemonium
So, I've had this problem with the Pandemonium Raid ending. Bread and Eric, are memories implanted on random souls, sure fine, but Themnibus is supposedly his real soul.
How?
Chronologically, the last we see of him, is on the First. We defeat him and suck his aether and by extension soul into the Crystal Tower. Then we use said aethersoul to power the tower to back in time to Elpis. There should be nothing left of him for Athena to mess with, never the less for him to perhaps reincarnate. Not only that, all this happened on a separate shard from the Source. Did Athena reach across the barrier between the shards and pull a tiny piece out of the Crystal Tower that's admittedly still running its time travel gate? This whole bit has been driving me nuts.