Thats why the Pearl of Time exists, so something that can delete and create timelines, and travel through time, WITH consequences, but not for the immediate user, if the user leaves the pearl, he will suffer the consequences
SO HERE'S THE SCALE
-ON THE TOP OF ALL THERE ARE REALITIES, WHICH ONLY THE TRAVELER CAN ACCESS
-UNDER THERE ARE REALMS, WHICH SPECIFIC CHARACTERS CAN ACCESS
-UNDER THERE ARE DIMENSIONS WHICH ARE HARD TO ACCESS
-UNDER THERE ARE MULTIVERSES, WHICH IS VERY COMMON AS AN ABILITY
-AND THEN FINALLY WE HAVE UNIVERSES, EVERYONE CAN ACCESS