Axel was just a mortal.
Thus, his stats had a limit. The normal limit was 2,500 points for the SS-Rank. Anything beyond that was God's territory, unable to be stepped on by one who's still in the mortal plane.
However, with the help of his accessories, the System's stat boost, and the additional boost from the Soul Seals, he was able to increase his stats beyond the normal limit. Even if Axel's stats exceeded what mortals could achieve, they were still far from reaching God's territory.
Axel fighting Wrath—the Demon King—and destroying his clone was basically the furthest he could achieve. Anything beyond that point was unrealistic.
Of course, that included actually besting a God—a Dragon.
Fafnir's claw was pulled out of Axel's chest roughly. Losing all support, his body fell straight down, almost like a ragdoll. Axel was still conscious and alive; however, he could tell that his injury was far from being "negligible."
'Shit...'
