Almagest

Almagest is a recurring spell in the Final Fantasy series. It is always an extremely destructive magic used by powerful enemy entities.

Final Fantasy V
Almagest is an extraordinarily powerful Holy-elemental spell that strikes all party members. The Superbosses Enuo and Neo Shinryu have access to this ability.

Final Fantasy Tactics
Almagest is damages all units within a two square radius emenating from the point of casting. Only the monsters Behemoth and Ultima Demon have access to the spell, though the former can be recruited into the party via an Orator. This effectively puts the power of Almagest in the player's hand.

Etymology
Almagest is the name of the ancient book written by the Greek philosopher Ptolemy. It presents an Earth-centered view of the solar system and was accepted as an astronomical authority for over a thousand years. Almagest means "The Greatest" in Greek.