Aaron, no matter how he countered this Corpse Shaman's brute strength, he is always left with absolute shock.
The overwhelming power, the transformation of strength...
'So, this is the famed Demon King Transformation?'
The corpse shaman had used Whiteless Transformation where all of it's entire eyes was white throughout.
This enhances it's brute strength and represses the emotions.
Besides, corpse had no emotions. Only humans are viable to cultivate the Demon King Transformation because, the skill makes them emotionless where they do anything without thinking about the repercussions of it.
Then, the Blackless Transformation turns the entire eyes black throughout and this one increases the Corpse strength by a huge margin.
Aaron was already feeling suppressed by this insane brute strength and Aaron knew fully well that the Demon King Transformation has one more transformation that would change the battle instantly.