Armblade Nunchuck +3

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

You have a +3 bonus to attack and damage rolls made with this weapon.

An armblade is a magic weapon that attaches to your arm, becoming inseparable from you as long as you're attuned to it. To attune to this item, you must hold it against your forearm for the entire attunement period. As a bonus action, you can retract the armblade into your forearm or extend it from there. While it is extended, you can use the weapon as if you were holding it, and you can't use that hand for other purposes.

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: Dungeon Master's Guide (2014) p. 213, Eberron: Rising from the Last War p. 276, Wayfinder's Guide to Eberron p. 120, Heliana's Guide to Monster Hunting - Part One