Able to return to "Another" world, Serge allies with the Acacia Dragoons against Porre and locates that dimension's Dragon Tear, allowing him to return to his human form. He then enters the Sea of Eden, "Another" world's physical equivalent of the Dead Sea, finding a temporal research facility from the distant future called Chronopolis. Lynx and Kid are inside; Serge defeats Lynx and the supercomputer FATE, allowing the six Dragons of El Nido to steal the Frozen Flame and retire to Terra Tower, a massive structure raised from the sea floor. Kid falls into a coma, and Harle bids the party goodbye to fly with the Dragons. Serge regroups his party and tends to Kid, who remains comatose. Continuing his adventure, he obtains and cleanses the corrupted Masamune sword from "Chrono Trigger". He then uses the Dragon relics and shards of the Dragon Tears to create the mythic Element Chrono Cross. The spiritual power of the Masamune later allows him to lift Kid from her coma. At Terra Tower, the prophet of time, revealed to be Belthasar from "Chrono Trigger", visits him with visions of Crono, Marle, and Lucca. Serge learns that the time research facility Chronopolis created El Nido thousands of years ago after a catastrophic experimental failure drew it to the past. The introduction of a temporally foreign object in history caused the planet to pull in a counterbalance from a different dimension. This was Dinopolis, a city of Dragonians—parallel universe descendants of "Chrono Trigger"'s Reptites. The institutions warred and Chronopolis subjugated the Dragonians. Humans captured their chief creation—the Dragon God, an entity capable of controlling nature.