Finally, the Primordials.
As with most cases of literature, this one won't be any different. Primordials are beings that have existed since the creation of time, space, the universe, and everything that led to possibly everything.
It wasn't enough to say that they control everything—No. Because most of them actually don't. And whenever they do, it is in a form so vague that one wouldn't even be able to call it control.
Perhaps it was better to say that it was the universe itself that was controlling them. They were like pieces of a clock—Existence itself is the battery, and they are the cogworks that made everything move—if one were to go missing, then all the universes will fail to move and work properly.
Something would be wrong, something will always be wrong from thereon if one were to go missing. They have watched the universes grow, they have watched it die… and they have watched it reset a million times.