Ascendant Dragon's Wrath Nunchuck

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

This weapon is decorated with dragon heads, claws, wings, scales, or Draconic letters. When it steeps in a dragon's hoard, it absorbs the energy of the dragon's breath weapon and deals damage of that type with its special properties. Whenever you roll a 20 on your attack roll with this weapon, each creature of your choice within 5 feet of the target takes 5 damage of the type dealt by the dragon's breath weapon. You gain a +3 bonus to attack and damage rolls made using the weapon. On a hit, the weapon deals an extra 3d6 damage of the type dealt by the dragon's breath weapon. As an action, you can unleash a 60-foot cone of destructive energy from the weapon. Each creature in that area must make a DC 18 Dexterity saving throw, taking 12d6 damage of the type dealt by the dragon's breath weapon on a failed save, or half as much damage on a successful one. Once this action is used, it can't be used again until the next dawn.

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: Fizban's Treasury of Dragons p. 25, Heliana's Guide to Monster Hunting - Part One