@KDY13 no it doesn't. He earns 1% xp per monster killed. He explains it in the beginning of the manhua. The more he levels up the more summons he's able to call upon and the stronger they are.
@Isaiah Cockerham he definitely doesn't earn 1% per monster kill. He would have already been maxed out if that was the case. Right now bro is earning a few million xp per kill. But because this is a super rare class, the exp qouta is much higher than the other classes