Armblade War Pick

Eberron: Rising from the Last War p. 276,

Type
Melee Weapon
Magic
Yes
Rarity
rare (requires attunement by a warforged)
Weight
2
Damage
1d8
Damage Type
piercing
Properties
melee

Description

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.

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