This short sword is engraved with runes disguised as natural cracks and creases in the metal and leather components.
When a successful attack is made with this sword, the player takes 1d4 of the damage that would have otherwise been dealt to their opponent.
Detecting the runes for what they are requires a relevant skill check. Removing the runes requires a dispel magic (Dnd, PF) or an erase (PF) spell. Failed removal attempts trigger the runes, and the caster takes 1d4 damage.