Cough!!
"This is the last of the ingredients," Karsha said in a tired breath. He has spent the last 12 hours concocting pill after pill. From the start his attempts to practice batch pill refining were stressful.
His first attempt failed horribly but he didn't panic, he had already anticipated the results. However, his second attempt yielded some results. Although not to his liking, he still felt he was progressing.
So he spent 3 hours practicing using basic ingredients for making basic pills like Stamina Replenishing Pills and the like. After his 4th attempt, he was able to make three 100% Pure Tier 2 Earth Grade pills. His purity level is something he takes seriously.
The Purity level determines how impurity free a pill is. A 50% purity means the pill will contain 50% impurities. So even if said pill is of higher quality, the side effects will also be high.