Rift in time

Events that can be triggered in all three dimensions that lead to the past version of that dimension, so when you use it in the overworked you can get access to Minecraft dungeons content in some form or in the end to access exclusive fauna from the past. Ideally there would only be accessible for free once per world but will automatically close after a limited amount of time told to players by a book found in the chest, give what you deem is an acceptable period of time for instance an hour to explore the past and get out otherwise they die or have to fight enemies trying to detain them for warping spacetime.