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First seen as an NPC during the Okeanos chapter of Fate/Grand Order, and later unveiled as a Saber-class Servant. A Greek mythological hero who was the leader of the Argonauts, and was married to Medea (caster) (fate). It should be noted that Fate's version of Jason is particularly abusive and cowardly, especially towards Medea, though he considers Heracles (fate) as his best friend.