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 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. The dagger can't
be used this way again until the next dawn.