Chrono Trigger/What Lies Beyond?

'''What Lies Beyond? (12,000 B.C. second time)'''

The Magic Kingdom Revisited
This is your last chance to revisit the magic kingdom of Zeal before it crashes into the earth. Before you move on, make sure you've already: On your way back to Zeal Palace, stop by the city of Kajar and talk to the Nu running the shop. He'll ask you if the pendant you have is really Schala's, if you say yes he'll say he hates liars, if you say no, he'll sell you the best weapons and armor currently available.
 * Talked to the girl who was ordered to destroy the sapling in Zeal Palace and tell her to secretly plant it, Fiona will have the sapling in 600 A.D. and it will activate the Sunken Desert sidequest.
 * Visited the two secret rooms in Enhasa and Kajar by opening the books in the order: Water-Wind-Fire. One will give you the Black Rock, and one will let you fight six Nus for some Tabs.
 * Gotten the two Tabs in Kajar, one in the corner of the room facing the bookshelf, and one by scratching the Nu after learning his scratch point in Zeal palace

You probably won't be able to afford much if any; Frog's Pearl Edge is probably the best choice due to its 1.5x damage against Magic Enemies amplification, but again it depends on who you like to have in your party. Head into Zeal Palace, where the Mammon Machine will have been taken away to the Ocean Palace underground. You'll get into a fight with Dalton, who's embarrassingly easy.

Dalton will disappear to the Ocean Palace, and what looks like a time gate will replace him. It'll turn out to be an elevator taking you underground, so it's time to move on.

Challenging Lavos
If you go back and challenge Lavos at this point, you should get The Prophet Ending. There will be a few scenes involving "the Prophet" from this period and a particularly nice speech from him, hinting that he would have gotten the chance to do what he wanted without your interference.