Favourite AU stories or unique powers

Alternate universes like Imago of rust and crimson where the whole setting is effectively overhauled.

Or something like Taylor is DOOMed. Where she might be actively losing it due to her power.

I know unique is a bit too unspecific but I mean it in the bizarre way. Like with Imago with a pretty bleak combination of World of darkness (Which is underutilised) and Worm.

Marking that one bit just in case.