Siduri informs the group that Gilgamesh apparently died of overwork, which puzzles the party. She also admits that there has been a recent wave of mysterious deaths all over Uruk, and Quetzalcoatl reveals that the third member of the Three Goddess Alliance, Ereshkigal, must be responsible. This causes confusion among the group, who initially assumed Ishtar was the third member until Merlin realizes that Ishtar and Ereshkigal must have both been summoned by the same ritual that summoned Ishtar. The group decides to confront and defeat Ereshkigal in order to free Gilgamesh’s soul. Since gods and Servants are powerless in the Underworld, only Ritsuka and Mash head there, guided by Ishtar. Ishtar admits that she had once attempted to invade the Underworld but failed, resulting in a humiliating defeat. In the Underworld, they find Gilgamesh, who also intends to confront Ereshkigal. As they journey deeper, Gilgamesh explains that Ereshkigal was forced to take charge of the Underworld against her will and has been trapped ever since. Upon reaching the bottom, the group encounters Ereshkigal and prepare to battle her.