This weapon was forged in the depths of the sea when iron was lost in the sea and over centuries the cold and pressure of the depths forged this dark iced blade. The hilt of this sword is always a little cold to the touch and the blade appears ever shifting as if some of the oceans currents have been trapped inside. This blade does cold damage instead of slashing damage. The blade does an extra 2d8 damage against elementals
Proficiency with a Longsword allows you to add your proficiency bonus to the attack roll for any attack you make with it.
This weapon has the following mastery property. To use this property, you must have a feature that lets you use it.
Sap. If you hit a creature with this weapon, that creature has Disadvantage on its next attack roll before the start of your next turn.
Notes: requires attunement, Versatile, Sap