Weapon (Longsword or Battleaxe), Rare (Optional Attunement)

Frostbite is a rugged and violent weapon, with an twisting, rough cedar wood handle and a cold serrated blade that is akin to frosted glass.

This weapon grants +1 to attack and damage rolls made with it. When you hit with an attack made with this weapon, the target takes an additional 1d4 cold damage.

Winter's Breath (Requires Attunement)
While attuned to Frostbite, its wielder can use their bonus action to activate Winter's Breath and enhance Frostbite's power, gaining the following abilities:

• Until the end of your turn, Frostbite deals 1d8 cold damage on a hit, instead of 1d4.
• At the end of your turn, if one target is hit at least twice by Frostbite while Winter's Breath is active, the target must make a Strength Saving Throw (DC = 8 + Strength Modifier + Proficiency Bonus). On a failed save, the target becomes Restrained as ice forms on the target. Huge and Gargantuan creatures have advantage on the saving throw, unless at least 3 attacks hit the target instead of 2. Creatures that are Resistant or Immune to Cold Damage are Immune to this effect.

Winter's Breath can be activated a number of times equal to the wielder's proficiency bonus and recharges on a long rest.