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The ancient weapons were the Underworld King, Brutto, and the Sea King, Bo Sakata.

The Underworld King was the most vicious warship in history. Legend had it that one cannon could sink an entire island. Its power was even more terrifying than explosives.

The Sea King was the Mermaid Princess, Shirahoshi. She had the ability to summon the Underworld King, who was located deep under the sea