"A helmet once worn by the warriors of an ancient warlike tribe from the Faron region. Wearing it draws out your inner animal, increasing your strength and battle prowess."
The Barbarian Helm is a helm found in Breath of the Wild. It has a base defense of 3 and increases Link's base damage. It can be found inside of a chest inside of the Tu Ka'loh Shrine, or can be purchased from Granté in Tarrey Town for 4000 Rupees.
The Barbarian Set (also including Barbarian Armor and Barbarian Leg Wraps) makes the stamina cost of maintaining Link's charge spin attack decrease a lot, when all equipped pieces have been enhanced at least twice.