Assassin’s Dagger

Weapon (dagger), rare (requires attunement)

This +2 dagger is inlaid with a runnel permanently stained a deep violet. Once per day as a bonus action after striking with the assassin’s dagger, the wielder can deal the target an additional 24 (7d6) poison damage on a failed DC 15 Constitution saving throw, or half as much on a successful one.