So far, looks like it’s mostly wall level. Only ones with feats and scaling that appears to be above that so far in the manga would be the ice swordsman (and maybe only through icefall wall) and Allen’s spirit core.
As for speed, looks like it’s mostly subsonic (based on scaling to Allen’s jogging speed being 18x faster after his training) with Allen’s instinctive reactions slash probably being around supersonic+ or higher (since he performs the whole slash in a time so short that the slash of a skilled swordsman barely moves).
The abilities seem mostly simple, the best ones for vs debate purposes so far being instinctive reactions, stat amping, fear auras, the 100 year sword, and what appears to be avatar creation from the time hermit.