As can be expected in Chrono Trigger, freeing Melchior sets all hell loose with Mt. Woe collapsing, Schala being taken by Dalton and the Ocean Palace becoming fully operational. Get Melchior back on his feet and he'll give you the Ruby Knife. Spend a night at the inn before leaving Algetty and heading to Zeal Palace via the Skyways, stopping off at Enhasa to get some cool stuff from the Nu there. Once at the Palace, head straight for the Throne room.

Use the portal he makes to go to the Ocean Palace.

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