Ahriman (Final Fantasy)

Ahriman is a strange, flying creature encountered by the Warriors of Light in the bowels of the Earthgift Shrine. This winged, one-eyed beast inhabits the northeast corner of the Shrine's final floor.

Strategy
Ahriman is the most difficult boss on the final floor, so save him until your party is level 45 or higher. He is a big fan of the Earthquake attack, which can instantly KO your party members. Protect Rings and NulDeath will guard against this. The Ahriman also uses Blaze, Thunderbolt, and Icestorm, all of which can deal more than 300 damage to your entire party, thankfully these devastating attacks are not used as frequently as Earthquake, but you must still make sure your White Wizard casts Healaga to patch up the damage. If you are lucky, Ahriman will use physical attacks, which are very weak and give you some extra breathing room.