Four Fiends (Final Fantasy)

The Four Fiends are the primary bosses in the original Final Fantasy. The four fiends consist of Lich, Kary (Marilith in later releases), Kraken and Tiamat.

Story
The Four Fiends are in an alliance with Garland, helping him maintain the time loop. Each fiend must be defeated twice by the Warriors of Light, first at that fiend's elemental dungeon, and then at the Temple of Fiends, 2000 years in the past.