This spell functions like magic weapon, except that instead of gaining a magical enhancement, the weapon becomes coated with magically created injury poison. This poison deals 1d4 Dexterity damage per round for 10 rounds. Poisoned creatures can make a Fortitude save each round to negate the damage and end the affliction. The Fortitude DC of the poison is 10 + ½ caster level + the caster’s ability modifier.