Anyway, since I have found out the origin of the dark-colored gas and found out that it was the fallen corruption qi, I have no use for it now.
As I thought of that, I channel my chaos qi towards Jerome's qi sea as I reinforce the chaos qi with my Sword Of Chaos fragment inside Jerome's qi sea. The chaos qi strand went towards the sphere of dense spiritual qi that isolated the fallen corruption qi inside Jerome's qi sea.
After entering the sphere of dense spiritual qi, I release the chaos qi within the chaos qi strand and I used the released chaos qi to eliminate the fallen corruption qi.
Since the fallen corruption qi possesses semi-sentience, it tried to resist my attack by using its body made out of fallen corruption qi to create fallen corruption qi attacks to resist my chaos qi attacks.