Ephemer is a member of one of the Unions of Keyblade wielders with a desire for knowledge who appears in Kingdom Hearts χ. He is also a friend of his fellow Union member Skuld, being the only one to befriend her at the time when no one else wanted to. Ephemer meets with the player character while attempting to gain more answers regarding the Foretellers' agenda, revealing any information about the nature of the worlds they explore, but he then abruptly disappears and never encounters the player character again. The player later learns from Ava that Ephemera and other Keyblade wielders known as "Dandelions" have entered the World of Light so they can be safe from the upcoming Keyblade War that will ravage the current world.