While Ace's avatar appeared to be in excruciating pain and almost as if its soul was about to shatter, it was all an act, and everything was under Ace's meticulous control, who was now sitting cross-legged under a young tree in the avatar's inner soul world and watching and manipulating everything with fiction knowledge divine trait.
The Deputy Guardian was only seeing what Ace wanted him to see. At the same time, he masterfully manipulated his avatar's expressions and body, which was a piece of cake for him since the Avatar's body wasn't like living things, yet no one could tell the difference.
Nonetheless, Ace had to admit that the soul-search power emitting from the Deputy Guardian was terrifying. He wasn't even an actual Ascension Lord yet, so he didn't dare imagine what kind of power an Ascension Lord would have.