After the tournament of power, the gods of destruction and angels realized that Goku was too much of a threat to all the universes, and because of that they decided to lock him in the Time Chamber... but you were there longer then Goku. Goku Wanted Revenge on The Angels and Gods of destruction but he wasn't sure about the grand priest and the two Zenos. The Time chamber can be used for training, it gives great benefits for training.. (Also you can have a harem with the girls in this if you want)