Dagger of Venom

Weapon (dagger), Rare
You gain a +1 bonus to attack and damage rolls made with this magic weapon.
You can use a bonus action* to cause thick, black poison to coat the blade. The poison remains for 1 minute or until an attack using this weapon hits a creature. That creature must succeed on a DC 15 Constitution saving throw or take 2d10 poison damage and become poisoned for 1 minute. It can re-attempt the saving throw at the end of each of its turns*.
The dagger can't be used this way again until you complete a short rest* with it in your possession.
Modifications: Denoted by asterisks.