Pledge Dagger

Narrow-bladed, with a split pommel and a hair-thin seam running the length of the steel, as though it were meant to come apart.

Each charge turns one hit into a pledge instead of damage: the target must make a Mind save or be unable to attack the wielder for one minute, and the pledge breaks the instant the wielder attacks it. The pommel unscrews itself one turn and stops when depleted.