A certain miserable young man was playing Disco Elysium when he got electrocuted and accidentally transmigrated. Well, transmigrating was one thing. It was a Lovecraftian world, sure, but at least he had the Key of Stars, so he could live carefree for the rest of his life. Then he got a pop-up from a certain chat group. He opened it and was utterly stunned.
Coming right at us now: the world of Warhammer 40K, a realm of the Warp where people are worse than beasts and there are four shovels of trash to deal with!
The Foundation universe, where every day you're either destroying the world or having it destroyed!
And the Limbus Company universe, where the population has dwindled until only one city remains!
"Gah! Every single one of you has an incredible mess on your hands!"
(PS: Most of these settings are complicated and come with piles of contradictory information, so if anything seems out of character or the settings differ, just treat it as my own version.)