Ahriman

Ahriman is a yellow, one-eyed round beast with a pointed fangs and a pair of wings. It first appears in Final Fantasy III as one of the final bosses. In several later games, smaller enemy varieties of Ahriman appear instead.

Final Fantasy III
In Final Fantasy III, Ahriman is a boss in the World of Darkness as one of the four Dark Crystal guardians. Ahriman in specific guards the Earth Crystal.

Final Fantasy remakes
Starting with Final Fantasy I & II: Dawn of Souls, Ahriman returns a boss along with the other three Dark Crystal guardians from Final Fantasy III. It is found on floor B5 of Earthgift Shrine. In the game, Ahriman's eye and mouth are glowing purple. It does not reward any experience and gil when defeated, but it drops a Dry Ether. Ahriman retains its green wings from the original Famicom release of Final Fantasy III.