Fate/Grand Order - Absolute Demonic Front: Babylonia

Absolute Demonic Front Mesopotamia II (1x20)

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Tiamat falls into the underworld, but there, she transforms into one of the Evils of Humanity: Beast II. Hassan-i Sabbah, the first Old Man of the Mountain, intervenes, using his power as Grand Assassin to deprive Beast II of her immortality.