The source of this Yin energy was obtained by the Phantom Horn race sacrificing their spirit bodies.
Transforming into ghostly fire was only one of the uses of the formation—the horn of the Phantom Horn race was their true source of power.
Streams of Yin energy gushed out from the ground like spring water.
Kui Yuan and the other Mandrill soldiers who had managed to escape the ghostly flames were akin to isolated wooden boats. They found themselves assailed by the Yin energy emanating from the ground, causing their faces to grow pale.
The ghostly fire itself was formed from Yin energy, so it was abnormally cold. It also could burn souls.
As it reverted to Yin energy, the cold grew even more chilling.
Soon, Yin energy filled the entire Phantom City. The entire city seemed to have turned into a lake formed by Yin energy.
This was not the Phantom Lord's power. She borrowed the power of the spiritual formation to form this scene.
