Winter's Dark Bite Melee Weapon M 6 H,2H 2d6 S You have a +1 bonus to attack and damage rolls made with this magic weapon. This greatsword is made of an unknown black metal. In most cases, it works as a +1 greatsword. But when used against a thessalhydra, it works as a +3 greatsword. While in the Upside Down, it works as a +4 greatsword. Source: Hunt for the Thessalhydra p. 4