Watching the Four War Souls continuously devour the yin-source energy within the Heavenly Keystone, I could not help but draw a deep breath.
I had never expected the yin source within the Heavenly Keystone could be absorbed like this.
The Four War Souls were already terrifyingly powerful. If they absorbed the yin-source energy inside the Heavenly Keystone, they might become even stronger.
After all, this was the Heavenly Keystone that had been suppressing the forbidden zone. It was the treasure that allowed the ferocious fiends of Yin Mist Forest to leave the forest, yet now the war souls had simply absorbed it.
I watched without saying anything, but inwardly, I was deeply shocked.
I had made some guesses before, but I had never considered the possibility that the Heavenly Keystone itself would be directly absorbed.
The process lasted around five minutes. The surface of the Heavenly Keystone had already become dull and lusterless.
The Yin Heavenly Keystone energy had completely vanished, leaving behind nothing but a broken stone full of cracks.
With a bang, the Heavenly Keystone fell to the ground.
Though it was covered in cracks, it was still hard enough to smash cracks into the floor tiles.
The Four War Souls did not waste any words and immediately retreated.
The chilling yin aura around them had also grown considerably stronger.
Then the Four War Souls spoke.
"Miss, we shall take our leave first!"
"Alright!"
After Xiao Yu spoke, the Four War Souls cupped their fists at me again.
"Lord Jiang Ning, we bid you farewell!"
"..."
"Ah!"
I cupped my fists in return. I still was not quite used to the way they addressed me.
It felt far too serious and formal.
The Four War Souls then turned and headed deeper into the Experimental Building.
They really knew