Breath of the Wild
Black Moblin are much stronger than their Red Moblin and Blue Moblin counterparts. They are much more resilient, have significantly more health, and wield some of the strongest weapons that a Moblin can carry.
These enemies wield some of the widest variety of weapons, including anything from Thunderspears, Flameblades, to even the weakest weapons such as Torches. However, the common weapons that they use include Dragonbone Moblin Clubs, Dragonbone Moblin Spears, Knight's Broadswords, Lizal Forked Boomerangs, and Knight's Bows.
Age of Calamity
Black Moblin in Age of Calamity are mini-bosses that often appear as leaders of outposts. They are much stronger variants of the standard Moblin, dealing slightly more damage and having more health. They first appear in the final scenario of chapter 3, The Road Home, Besieged. When defeated, they will occasionally drop a Moblin Fang, Moblin Horn, or some Moblin Guts. After each Black Moblin is defeated, the player will receive a Moblin Trophy, which can be used to complete quests or upgrade weapons of the various warriors.