Black Bokoblins are enemies that appear in Breath of the Wild.
Hyrule Compendium Entry
Black Bokoblins are a stronger variant to Blue Bokoblins. They are known to be resilient and armed with advanced weapons. Like other Black variant enemies they have a strong resistance to burning. They can with stand strong heat like being around the Eldin Volcano reigns and Gerudo Desert reigns.
Black Bokoblin riding a Horse
Link fighting Blue and Black Bokoblins in the Great Plateau in Master Mode