Sauronesque

adjective1

1. •
   Having similar traits to the fictional character Sauron from the works of J. R. R. Tolkien, including evilness, tyrannicalness, or all-seeingness.

   • This crew faces the Sauronesque embodiment of evil, the Shadow, its minions, the savage Reavers, and treachery in the usurper of Arlen's throne. — 1984