Weapon, rare (requires attunement)

This dagger's black hilt is wrapped by a single ivory snake. The snakes mouth is open at the pommel, and the length of the snake is hollowed out. Shallow grooves twist and curl up the blade from the tip of the snake's tail.

When a poison is applied to this dagger through the mouth of the snake, it runs up through the tail and into the grooves of the blade. Poisons applied to the dagger in this way last a full day instead of one hour.