There was no other way to set up a magic array in the destroyed desert. There were too many demonized animals and plants in the desert, and they needed to absorb more energy. Therefore, Zhao Hai wanted to use the magic array to absorb a large amount of natural energy into the desert. This way, the demonized animals and plants could maintain their original strength. At the same time, it would be beneficial for the environmental transformation of the destroyed desert.
As for using Yu Wa as a part of the defense system, there was no other way. Yu Wa was still absorbing the power of destruction in the desert of destruction, so she naturally had to treat him as a member of the defense system. If there was no more power of destruction in the desert one day, Yu Wa would have to release some power of destruction to let others think that the desert had not changed. Only in this way could the desert maintain its current state.