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Time's Eclipse is a location in Chrono Trigger (DS). It is presented using the area where Lavos' the first form is fought universally as well as the Mammon Machine in the Black Omen. However, it is not explicitly stated whether this place is where those two were fought or if it was simply a design choice made during development.
If the player conquers all three Dimensional Vortex areas, the bucket at the End of Time will open a Gate leading to Time's Eclipse where a version of Magus is encountered, regardless of whether if he was killed or recruited, or in the latter case, whether or not he is in the active party. If he was recruited and is in the active party, he will react to the reveal of his other self, who does not react to him.