LuisCarlos17f
Legend
I have got other theory, the cristal spheres are like a barrier to keep the "sacred timeline" against the alteration of the space-time continium caused by chronomancers and time-travelers from alien worlds. Do you rebember the teleserie "Loki" in Disney+? (If it happens in the begining of the first episode it is not a spoiler) the timecop/AVT had got a special gadget, the reset charge to "fix" the alterations of the timline. Sometimes in timelines where things go really wrong, the crystal sphere is totally locked to avoid the happenings could cause troubles to other places.