Astaroth's main threat is its magic, but it also has a weak physical attack which drains HP and heals its own. Its magic abilities are Firaga, Blizzaga, Thundaga, Death, Flare and Embrace, all of which can be reflected.
Compared to the other bosses on this floor, Astaroth is fairly easy as long as the player has party members who can cast Reflect, or can use items to grant themselves Reflect. With Reflect up Astaroth's primary offense is crippled, leaving the player free to whittle down its HP.
Astaroth in demonology is a prince of Hell. In art, specifically in the Dictionnaire Infernal, Astaroth is depicted as a nude man with dragon-like wings, hands, and feet, a second pair of feathered wings after the main, wearing a crown, holding a serpent in one hand, and riding a wolf or dog.