Black Boss Bokoblin Horn
Boss Bokoblin Horns deal much more damage then regular Bokoblin Horns
Killing Black Boss Bokoblins
Black Boss Bokoblin Horn is a material found in Tears of the Kingdom.
Tears of the Kingdom
"A double-edged, axe-shaped horn with two leader bands. Attach it to a weapon to greatly increase attack power, or cook it with a critter to make an elixir."
A Black Boss Bokoblin Horn is dropped by all Black Boss Bokoblins in the game. It can be attached to a weapon to increase attack power by 27, or cooked with creatures to make an elixir. If used in an elixir, it will increase the duration of any effect by 40 seconds.
Black Boss Bokoblin Horn default Hyrule Compendium image