Experience
"Man… your ability to get beaten up sure is something else," Merlin said.
Even though the world was on fire, Ryan couldn't even breathe, and everyone had been killed. Merlin still was acting the same as ever, as if nothing was his problem. That attitude sure was unnerving…
"How do you feel getting your ass kicked like this by an enemy that isn't even trying to kill you?" Merlin asked.
If Ryan could speak, he would, but he couldn't. Still, if he actually could do anything, he would smack that annoying little creature. While Ryan wasn't an endurance-type warrior, for the better or for, the worse, his vitality had reached stupid levels. Even though he always focused on increasing his attack power, he still got some impressive defensive boosts. He also had the blood of Asgardians and the Olympian gods… no wonder he could live in such an environment and even survive when thousands of fragments of the moon smashed him.