Venomous Fang Dagger

This dagger is crafted from the fangs of a Decaying Serpent, its hilt wrapped in snake skin. When wielded, it grants a +1 bonus to attack and damage rolls. Once per long rest, when you hit a creature with this dagger, you can deal an additional 2d6 poison damage. The target must succeed on a DC 13 Constitution saving throw or be poisoned until the end of your next turn. While the dagger is in your possession, you gain resistance to poison damage and advantage on saving throws against being poisoned.