The Congress Dances (E17)

The power of the Grail, now in the hands of the Laḫmu, has transformed the Persian Gulf into the Chaos Tide. Any living thing that touches this sea is instantly mutated into a Demonic Beast. As the Chaos Tide advances toward Uruk, Fujimaru and company form a desperate plan to destroy Tiamat as a last-ditch effort to save the city. Fighting with Ishtar at his side, Fujimaru uses a Command Spell to empower an attack against Tiamat who resides at the heart of the Persian Gulf. However... (Crunchyroll)