Skyrocketed!

After the Advancement, Han Xiao's health point conversion ratio increased from 1:15 to 1:20. It was obvious to him that his body was stronger. He could feel a ball of energy down in his abdomen, invigorating him.

This second Advancement did not unlock as many skills as his first Advancement did. His first Advancement had felt like a complete rebirth, while this second Advancement was way smoother a process than his first one.

Though not explicit as a description on the interface, Han Xiao noticed that his perception had become more acute. The world was more vivid in his eyes.

If he had to describe how the Advancement felt, it would be 'natural'. He could feel the breeze flowing around his limbs and smell the mix of particles in the air. His senses were amplified by several notches.

The second Advancement was a prerequisite to unlock many skills, and of course, the most obvious benefit was that he could upgrade to LV 60.