The gang approaches Tiamat, and Ishtar puts everything into her largest attack, which Ritsuka supports with a Command Seal: Angalta Kigalse. Tiamat is defeated in the first five minutes, but I didn’t believe for a second she was gone for good. Why? Because there are four episodes left.
Ishtar only destroyed a tiny part of Tiamat; her mammoth body proper rises up, and with it the sea levels. It’s not regular seawater either, but a poisonous red-black substance that means death for anything living. All the gang can do is withdraw to Uruk.
Gilgamesh just manages to save the city by deploying the Fang of Napishtim, which is a one-time thing, like Ishtar’s all-or-nothing attack. He’s glad Ritsuka and Mash are alive, but is open to ideas. Romani doesn’t have any good news for them: Tiamat literally has no weaknesses and can not die as long as there are humans alive on earth.
Oh yeah, and there are only 500 humans left. Things have only managed to get more and more dire, but humanity hasn’t lost as long as there’s even one of them alive, and as long as Gilgamesh and Uruk survive, humanity will be able to endure.
Enter Ereshkigal, who very informally reports to Gilgamesh that a huge number of souls have suddenly been dumped into her lap; far more than the natural balance of things would allow. That’s when it dawns on Ritsuka and Gil at the same time: in order to defeat goddess of life Tiamat, she must be dragged down into the underworld, where there is no life to sustain her.
Ereshkigal has certainly never attempted anything of the sort, but having held a grudge against Uruk for many years, just so happens to have prepared to open a gate to the underworld underneath the city. Thanks to her initiative, the time to prepare such a gate is reduced from ten years to three days.
The problem is, Tiamat is only two days away at her current speed, which means they have to somehow hold her off for twenty-four hours before Ereshkigal’s gate is ready. That’s a tall order, considering even the most powerful entity among them, Quetzalcoatl, doesn’t think anything can be done to even scratch Tiamat.
That’s when Gil turns to Ishtar, assuming she’s been holding back her ace in the hole this whole time. The Bull of Heaven, Gugalanna, will surely be sufficient in keeping Tiamat at bay for the necessary duration. Only one problem: Ishtar doesn’t have Gugalanna; she lost it and has no idea where it is. Following that disappointment, Gil proposes everyone relax and try to get some sleep—it could be the last time they ever have a chance to do so.