 After returning to AD 600, they challenge Magus, believing him to be the source of Lavos; the battle disrupts the spell Magus was using to summon Lavos and causes a time gate that throws Crono and his friends to the past.Back in prehistory, Ayla joins the group to battle the Reptites and witness the true origin of Lavos when the Reptites' ruler calls him down from the stars to crash into the planet.Entering a gate created by Lavos's impact, they go to BC 12,000, an ice age, where the party finds the Kingdom of Zeal, who recently discovered Lavos and seeks to drain its power to achieve immortality through the Mammon Machine.