As a ruler of a fiery nether dimension, Mephisto lives to control the spirits of mortals he collects and imprisons. Although this demon is not the Biblical Lord of Evil, his nefarious actions and fiendish powers are worthy of the Devil himself.

noun

(Mephisto for short); one of seven chief devils in medieval legend and later literary and operatic works, to whom Faust, or Faustus, sells his soul for knowledge and power

adjective

diabolic, crafty, powerful, malevolent, sardonic, etc.

Diablo