Frostsaber

Damage: 1d6 Slashing + 1d6 Cold
Modifiers: Melee Attacks +1, Melee Damage +1
When you roll a 20 on your attack roll with this
Magical Weapon, the target takes an extra 2d6
cold damage and suffers Frostbite, making them
more susceptible to critical hits.
Frostbite: For 1 minute, target creature suffers
critical hits from attack rolls of 19 or 20.
Requires Attunement.