At this moment, all the Demonic cultivators finally fell into despair.
"That lightning... Where did it come from? Yelin has been standing in the same spot from the very beginning, and he hasn't even attacked!"
"It's the formation! Outside the cold pool, I don't know when, the Nine Heavens Thunder Formation has been set up. This is an ancient formation. Ancient texts record that this formation can easily slay Nascent Soul Great Circle cultivators who set it up, and even early Spirit Severing powerhouses would find it extremely difficult to break through!"
Chapter 229