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This has always been a question Jiang Lu was very curious about.
Netherworld suffered a heavy blow, yet it was Zeus who stepped in.
This isn't to say that Zeus shouldn't have intervened; after all, the Netherworld is right behind Mount Olympus, and the relationship between the two is more than just mutually dependent—the Netherworld itself is part of Mount Olympus's domain.
However, Hades has not shown up even once from beginning to end, which is indeed quite strange.
At first, Jiang Lu thought that Hades had been busy dealing directly with the enemy on the Netherworld Battlefield, but later he discovered that this was not the case.
Since the opening of the Netherworld Battlefield, Hades had never made a public appearance, and without his leadership, the Netherworld side was completely unprepared for the lightning war launched by the Underworld, unable to muster an effective resistance in a short time.