Ares the... Mortal

Xena, still trapped in Callisto's body, makes a shocking discovery when she comes across an altogether altered Ares From Xena Warrior Princess Season 2 Episode 8, "Ten Little Warlords": Joxer delivers a letter to Xena, who is still in Callisto's body, telling her that ten of the greatest warriors are being challenged by Sisyphus to slay a monster known as the Barrachus. The reward is Ares' divinity. Meanwhile, Earth is beginning to lose all sanity, as a result of the lack of a Deity of War.