Da Yu Is Fat Again
I think the evolution procedure become very simple. He should make the materials as concoction. There should be a chance of failure while making concoction for every evolution so that this novel shouldn't look so easy. Every higher evolution, the rate of failure should be high so that it balance the whole novel. Strict mental power should required for making medicine so that the MC also improve his training. It was just my suggestion. And if you want to add game type element where you can add materials in the system window and get solution prepared itself with chances of failure with every higher level than it would be good.