Ares was the god of war in Greek mythology. He is one of the twelve Olympians and the son of Zeus and Hera. He often represents the physical or violent aspect of war, in contrast with Athena, who function as a goddess of intelligence include military strategy and generalship.
Ares is also the counterpart of the Roman god of war Mars.
Ares can only be encountered through a series of quests. Players must give a Jack Ripper card to the Jack Frost NPC in Third Home after having completed the Stray Frost quest. He gives the player an EV-GL floor card. Players can clear this floor by defeating the Coatlicue mini-boss and inputting the password 401 on the next floor. When players defeat the Lamia on the final floor, they're given a valuable item.
This valuable item triggers a conversation with the Artemis NPC in Shinagawa's bronze-level Catacombs during the New Moon period. This NPC gives the EV-GA card in exchange for Gift Melon for Reapers. This floor opens with a fight with Pallas Athena that can only be passed by applying Ambrosia. The following floor contains a timed fight with Ares and three Furiae. By clearing this floor on time and correctly, players are able to fuse him in a special double-fusion of Artemis and Typhon.
Ares appears in the Challenge Quest The Cursed Gauntlet. Where he refuses to leave the gauntlet that belongs to his dead master and will only leave if someone stronger than him beats him in combat. He starts a battle with Flynn and states he will hand over the gauntlet if he is stronger than him. He admits defeat after losing to Flynn and leaves the machine, hoping the next time he meets Flynn it will be as allies.