Tiamat is by far the toughest boss Ritsuka and Mash have had to face, and they don’t even try to fight her themselves. Ushiwakamaru manages to make it in time and delivers one hell of a fight—with nary a wardrobe malfunction—in the most exciting, best-looking and sounding sustained battles in a show that’s been packed with them. Ushiwaka is utterly devoted not just to protecting humanity, but her friend—not master—Ritsuka, a boy who remembers her tale a thousand years after she left the mortal plane.
Her own history and legacy is also at stake, so she fights like there’s no tomorrow, giving absolutely everything she has, including her Noble Phantasm. It isn’t enough. Tiamat regenerates all of the severed snake heads and holes Ushiwaka’s attacks made, and she ends up in a heap, spent and exhausted.
King Leonidas sallies forth with his 300 Spartan warriors to spell Ushiwaka, but despite more impressive fireworks and hyper-masculine posturing, he lasts an even briefer time than her, as all of his defenses gradually fall and he is turned to stone by Tiamat’s Mystic Eyes, eventually crumbling to dust.
Ushiwaka gets her second wind after Leonidas, but it’s to no avail. Ultimately it’s “Enkidu”, who reveals himself to actually be Kingu, who stops his mother and gets her to withdraw. If she were to take Uruk, the alliance with the other two goddesses would fall, and she’d have to fight them, draining valuable time and effort. Instead, Kingu is content to leave Ritsuka, Mash, and Merlin alone for the time being.
His big-picture plans include the release of the second generation of Demonic Beasts, which we learn are being grown in Tiamat’s lair. It is where a beaten Ushiwaikamaru finds herself, and because she cannot hold her “cheeky tongue”, Kingu decides to bestow upon her a fate worse than becoming just another run-of-the-mill beast, but a monster born in the primoridal “mud of the holy grail.”
Needless to say, this is awful news for humanity. Leonidas is beaten, Ushiwaka is in the hands of the enemy (and her friends believe her to be gone), and Benkei peaces out. As Lord Elrond once said: “our list of allies grows thin.” How in Babylon are the good guys going to turn this around?