Metabot's Manual of Magical Maneuvers

Honed Edge

2-level Transmutation

You magically hone your blade to the point that it passes through bone and sinew as if through air. Your attacks with that weapon within the spells duration deal an additional 2d8 force damage. If you rolled a one on any of these d8s, the magic preserving the edge fails, and the spell ends.
At higher levels: When you cast this spell using a spell slot of 3rd level or higher, the spell does an additional 1d8 force damage for each spell level above second.