Because Azerion's Soul had merged with the sealed space, he had also lost the ability to leave Woster. His soul was no longer something that could simply return to his body entirely and move on. His physical body couldn't leave that underground area either.
The problem was that his body had also become his greatest vulnerability. Even though his soul had merged with the sealed space, it was still connected to his physical body as well, leaving him somewhat split between the two.
His soul existed both inside the sealed space and within his body at the same time. This strange state was also the reason Azerion couldn't truly die. As long as that connection remained, neither side could completely disappear.
