He mentioned a trigger of time in one of his earlier posts: That could be the Chrono Trigger, an item that was used to revive Crono after he died during the fight with Lavos 'Outer Shell' - the Chrono Trigger froze time and they saved him by picking him out in front of some attack from Lavos. His death was reversed that way.
Quote: "Crono then challenges the creature, attempting to save the lives of his companions, but Crono is killed, his body vaporized by the monster. Lavos then destroys the entire kingdom, transports its prince, Janus, to the Middle Ages, and sends the three Gurus — Melchior, Belthasar and Gaspar — to various places throughout time. Before the remaining party members and Magus can be killed, Schala, Zeal's princess, saves them by transporting them out of the palace and to the only remaining human settlement while she remains behind. However, Crono's friends have little time to grieve before Dalton, a former leader of security in the kingdom, arrives at the village and declares himself ruler of the world. Having saved the Blackbird — an ornate airplane — from destruction, he interns the party aboard and takes to the sky. Additionally, Dalton impounds the Epoch, and has his henchmen give it flight capabilities. The party soon escapes and defeats Dalton in a battle atop the redesigned Epoch, which the adventurers then use to accidentally blast the Blackbird while they escape. Distraught over Crono's death, they meet with Magus, who reveals that he is Janus Zeal, and grew up in the Middle Ages waiting for a chance to get revenge on Lavos.[18] Moreover, he offers the party members the opportunity to settle their feud in a final battle, and informs them that Gaspar could possibly help bring Crono back.[19] Should the player refuse to fight Magus, he then joins the party.[20] Visiting the old man at the End of Time, the player learns that he is Gaspar, transported here during Lavos' destruction of Zeal. He gives them an egg-shaped device called the "Chrono Trigger", which he explains allows for a special form of time travel. Following his instructions, they soon use the device to visit the moment of Crono's death and freeze it in time, extracting him from the moment just before he would have been killed."
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