When Mistress Red-Dust's divine sense was shattered, Chen Hetian detected it. First, he looked out at the Wildlands, then he looked down at the huge eye, his expression that of amazement.
Obviously, he had also detected the True Spirit Resonance....
A true spirit could call upon the quintessence of its voice to unleash a True Spirit Resonance, but would usually only do so in extremely dire circumstances. It was quite draining on the true spirit, but was incredibly powerful, so much so that even a deva would be forced to go all out to defend against it.
Although the True Spirit Resonance from moments ago had not been fully powered, it had been enough to destroy Mistress Red-Dust's divine sense, and would definitely have been very draining to the true spirit.