Seeing how strongly Tsunade reacted to Thanatos's name, Kakashi hurriedly asked, "Lady Tsunade, do you know this Thanatos? If you know anything, please tell me."
Tsunade shook her head. "I don't know Thanatos, but I heard my grandfather mention him. When I was little, Grandfather often told me all sorts of strange stories. He was the one who told me about Thanatos."
Kakashi asked in surprise, "Lord Hashirama Senju, the First Hokage?"
Tsunade nodded. "Yes. I remember Grandfather saying that Thanatos was a death god. He had a brother named Hypnos, and he was one of the Twin Gods who served Hades. He was responsible for taking people's lives and souls."
Everyone present was shocked to hear that Thanatos was actually a god-and a death god specifically responsible for taking lives and souls. The Third Hokage asked doubtfully, "There are certainly legends of death gods in mythology, but do they really exist?"
Tsunade shook her head. "I'm not entirely sure myself. I only remember what Grandfather told me. In his stories, this world seemed to have countless gods, and they belonged to different factions. Thanatos, for example, served Hades of the Olympian Pantheon. In Grandfather's stories, Hades ruled the entire Underworld, the world of the dead."
"The Olympian Pantheon? What's that?" Mitokado Homura asked in confusion.
Tsunade replied, "In Grandfather's stories, it seemed to be an organization formed by a group of gods. I don't know the details either, but Grandfather said the gods must have gone through some great upheaval, and all of them were lost in it. Whether they died or were sealed away, he didn't know. That's why people hardly ever see gods now. Grandfather said people called that upheaval Ragnarok."
Hearing Tsunade mention Ragnarok, Kakashi suddenly exclaimed, "Ragnarok? I remember Naruto mentioning Ragnarok when we first