Just like the Tower of Dominion, this place had already been regarded as an extension of Weizemay Manor. Gaven could summon those True Wraiths that were confined here at will, the only thing he needed to pay attention to was balancing the load on the keystone with the number of True Wraiths.
That is to say, Gaven originally had the ability to wield the power of twenty thousand Shadows, but because a portion of the True Wraiths needed to be converted into physical form, he could only use ten thousand.
In plain terms, it was still a contest of Shadow Energy between the two sides, just that it had turned into a more direct form of Ghostly warfare.
The appearance of this unique phenomenon was eighty percent related to the uniqueness of Weizemay Manor and the Shadow Power it possessed, giving it more of an advantage under such circumstances.
Just as Arms had said before, the victor would take all.