Lycan Nunchuck

Nunchucks are martial melee weapons composed of two hard batons connected to one another by a short chain.

Made from the claws, teeth, and bones of lycanthropes, these weapons are particularly effective against other lycanthropes or vampires. You gain a +2 bonus to attack and damage rolls made with this weapon. Additionally, on a successful attack against a lycanthrope, the target is forced back into its human form unless it succeeds on a DC 10 Charisma saving throw. Also, damage done to vampires with lycan weapons cannot be regenerated until the creature finishes a short rest.

Special: Flourish. When you are wielding the nunchucks in two hands and take the Attack action on your turn, you can attempt to flourish with the weapon immediately before you make your first attack. To flourish, make a DC 13 Dexterity check, adding your proficiency bonus if you are proficient with nunchucks. On a success, you gain a +2 bonus to the first attack roll you make this turn. On a failure, you deal bludgeoning damage to yourself equal to your proficiency bonus and gain no bonus from your flourishes this turn.

Finesse: When making an attack with a finesse weapon, you use your choice of your Strength or Dexterity modifier for the attack and damage rolls. You must use the same modifier for both rolls.

Versatile: This weapon can be used with one or two hands. A damage value in parentheses appears with the property—the damage when the weapon is used with two hands to make a melee attack.

Proficiency: martial, nunchucks Source: Grim Hollow: Lairs of Etharis p. 111 (Third Party), Heliana's Guide to Monster Hunting - Part One