Unfortunately, they didn't possess the insight to recognize the invisible Yin Thunder and naturally couldn't understand Li Venerable and the Demon King's sinister intentions.
Boom! Boom! Boom!
Out of a clear sky, dozens of thunders exploded from nothing.
The numerous Underworld Cultivators and Demon Beasts fleeing in all directions saw about a dozen figures immediately fall from the sky, making no further sound.
The bodies of these individuals were enveloped in a layer of purple thunder light, their flesh already charred black.
A Thunder Spell that Nascent Soul Cultivators could barely withstand spelled instant death for Golden Core Cultivators and Third Grade Demon Beasts!
This scene caused those who were a step slower in escaping to tremble with fear, no longer daring to flee outward.
However, for Li Venerable, this was already enough.
With the sacrifice of these dozen or so lives, he had discovered the gap in the invisible Yin Thunder.