Dimensional hopping elevators

A dimensional hopping elevator is a phenomenon that can randomly happen in every universe.

Description
These particular elevators appear in a random universe and stay opened for a certain period of time, to then close and disappear, regardless from being empty or full. These elevators keep traveling from universe to universe, even in zones that couldn’t be accessed from anyone. They can also travel in time. These elevators are completely indestructible and uncontrollable, in fact not even a very powerful entity or a narrator could control them. The origins of the dimensional hopping elevators is completely unknown and no ones knows from where they came from or who created them.