Armblade Whip +3

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.

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.

Reach: This weapon adds 5 feet to your reach when you attack with it, as well as when determining your reach for opportunity attacks with it.

Proficiency: martial, whip Source: Dungeon Master's Guide (2014) p. 213, Eberron: Rising from the Last War p. 276, Wayfinder's Guide to Eberron p. 120, Player's Handbook (2014) p. 149