Azurewrath

+1 Longsword- criticals on a natural 19 or 20, and target is hit by Frostbite cantrip (2d6 cold damage, disadvantage on next attack until end of its next turn). Creatures immune to cold are unaffected by the spell, creatures resistant to cold take half damage from the spell, no disadvantage. But cold creatures still take the critical hit.
The sword has a vicious, sawtoothed blade and the pommel is set with a blue gem. Claimed by Urban.