Adui
Well Without the immemorial sword formation, he doesnt have anything preventing his origin in the dark universe from getting completely devoured and assimilated so whoever he is in the primordial cosmos, he wont receive any of his origin back as everything that sliver was becomes integrated into the slime. big brain moves
Heh, I don't think this 'expert' actually knew anything about the Universal Emperor Slimes. He mentioned the 'most powerful Universal rank Hegemonies' implying he isn't one himself. Pretty sure that the Universal Emperor Slime that held an entire Universe hostage would require at least Universe rank experts to defeat it. And after they exterminated it's race, they probably removed all mentions of it from history.