Ryougi Shiki is more broken than I thought.
The ability to destroy the existence of anything that can be conceived. Physical objects, living things, time, distance, gravity, etc. if it exists, it can also not exist.
"...She can also kill a concept such as the distance between her and an enemy, allowing her to move in a way that we're not entirely certain if she was merely incredibly fast or genuinely warping through space. Beyond that, she can kill multiple things within a single motion. She also claims that it would be "so very, very easy" for her to bring about the end of all creation. "
If he exists, then I could kill even God.