The Great Reset

The Great Reset is an event that was created by Palpatine, using the World Between Worlds in an attempt to prevent his death in 4 ABY in Legends, by manipulating time, creating what is known as the Kathleen Timeline, or K-Canon, or the current canon. Upon his attempted return in 36 ABY, he attempted to rewrite history again, forcing the two timelines together. However this had an unintended effect: Multiple people from wildly different eras fro mboth timelines were forced together in different eras, Palpatine, Yoda (of the Clone Wars era), Starkiller (Galen Marek), Kota, and Rey all arrived in the Old Republic Era, around this timeline's version of the Sacking of Coruscant. Meanwhile, Revan, instead of fading into the Force with his dark side body, allowed him to continue operating independently after interference in the Force via Valkorian.