Dagger of Venom

You gain a +1 bonus to attack and damage
rolls made with this magic weapon. You
can use an action to cause thick, black
poison to coat the blade. The poison
remains for 1 min or until an attack using
this weapon hits a creature. That creature
must succeed on a DC 15 Con save or take
2d10 poison dmg and become poisoned
for 1 minute. The dagger can't be used this
way again until the next dawn.