Amphiptere appears as a boss in Fire Book. A demon of Niflheim, he disguises himself as Melchizedek and with Shokuryuu imprisons Enoch in Niflheim as a statue. He guards the gate that leads to Niflheim in Future Harajuku and taunts Jin with the devastated world of humans, offered as a sacrifice to the holy battle. Though killed, he taunts him that his actions are meaningless as the battle will last forever. The revived Amphiptere can be found in the Babylon Labyrinth.