"[The rest of her stats]. Potentially Unknown under untold context (Prophesied that the Scarlet Witch would eventually either rule or destroy the multiverse, of which there are infinite universes, but neither of this came to be and Wanda didn't care to follow this path. It's unknown if she can even retake it if she wanted to, in what way would the multiverse be destroyed, and what is required of her to do this [Ex. prep time, or to keep growing in power over time]. See Note 1 below)
Note 1: The movie that established this also established a mechanic in which universes destroy themselves via [[Environmental Destruction]] if at least one sentient being in them travels to an alt. universe of their own for too long. The process is Universe level at best, assuming a universe or two get annihilated; the universes' timelines and the higher-dimensional space between them not being destroyed means that it can't be Low Multiverse level. The process is also shown to consider "destroyed" a universe that still has its Earth, as well as buildings, cars, and other structures in it, if everything is in ruins. It's possible that prophecy refers to an evil Scarlet Witch leading to the destruction of the multiverse by establishing a rule over it with beings traveling from their universe into a different one (Similar to how Wanda used inderdimensional demons as minions), exploding this universe-destroying mechanic that Wanda was unaware of. In that case, it wouldn't be Multiverse level+, but far lower, and just Environmental Destruction, but this is speculation and it's still unclear what the prophecy entails in a detailed manner.
