Dagger of Pris

Adding a drop of water to the weapon used in the casting it becomes immediately covered in a layer of frost.

Make a melee weapon attack, on a hit in addition to the regular effects of this attack the target must succeed on a Constitution saving throw or begin to freeze from the inside. At the start of each of the targets turns as long as it is freezing it takes 2d6 cold and 2d6 necrotic damage. At the end of its turn it can repeat the saving throw, ending the effect on a success.