"A skeletal arm that keeps moving even after it's severed from its body. It's kind of gross to strap it to your back, but it'll do in a pinch. It's old and fragile, so it's quick to break."
The Bokoblin Arm is a melee weapon found in Breath of the Wild. It is a skeletal remain of the arm of a Bokoblin and can be acquired after defeating a Stalkoblin. When the Bokoblin Arm falls to the ground, or when Link has it equipped, its fingers still remain animated. When the arm is on the ground, other nearby Stalkoblin or other enemies nearby may pick it up and use it as a weapon to attack Link.
With a base power of 5, it is one of the weakest melee weapons that Link can find. Furthermore with a durability score of just 5, only the Tree Branch will break faster.
As Stalkoblin are found all throughout Hyrule, most commonly on the Great Plateau and in the Ridgeland region. However, due to their abundance, as well as the fact that every single Stalkoblin will drop a Bokoblin Arm, this is one of the most common weapons Link can acquire.
The Bone Atk. Up is a set bonus that will be upgrade the attack power of all bone weapons, including the Bokoblin Arm. It can be acquired as a reward from multiple armor sets.