Barons of Hell resemble the classical 'goat-legged' depiction of Satan. They attack the player by scratching with their claws when close or throwing green balls of energy at a distance. A pair of Barons, referred to internally by id Software as the "Bruiser Brothers", serve as the bosses at the end of Knee-Deep in the Dead, the first episode of Doom. Barons also appear as regular enemies in the later episodes and in the sequels to the game.