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The Gatekeeper of Tartarus

Kou and the others had arrived at the same chamber where they’d once faced Echidna.

A vast space—likely a hangar meant to house some kind of interstellar warship.

「Kou. That shadow…」

「Matt, stay back.」

「Understood.」

Following Kou’s command, Matt retreated to the rear.

「So this is the lair of the infamous Mother of All Monsters, Echidna.」

「‘Mother of All Monsters’, is it? My, how flattering, O feeble king who long sought shelter beneath a witch’s wings.」

Echidna’s avatar appeared—her appearance was exactly the same as when Kou and Asia last encountered her.

「But the victory is yours, I concede. To think you would flood my stronghold with those absurd weapons and reduce it to rubble.」

「Your actions were suicidal, Echidna. Give up and merge with Libya already.」

「Oh, but this is not the end, not yet. Come forth!」

From the control room at the back of the chamber, a silhouette emerged.

A dark and blue Mythology Weapon, matching the one seen in