Rod's heart sank, he had intended to test the Nightmare's abilities using the Evil Ghost King, urgently he shouted, "Book, what's going on?"
The Book of Knowledge also froze, flipping through pages without writing a single word.
However, the constantly silent puppet suddenly said, "The Nightmare possesses Strong Source."
"Strong Source?"
Rod was stunned for a few seconds before he remembered, Strong Source referred to laws of a higher position, closer to the Primordial.
Any existence with a Strong Source was extremely dangerous and powerful, possessing terrifying and incomprehensible abilities, a more powerful soul, and deeper Spiritual Energy.
It was said that Strong Source was the core key for a monster to step from Strong Level to King Level.
Without Strong Source, no matter how powerful the Spiritual Energy, a monster would always be just above Strong Level, never crossing the Thunder Pool.
"Is it a King Level Monster?" Rod asked, shocked.
