After Ma Rong left, Alex still stayed behind and made quite a few more pills. He made 3 different types of pills after the Qi Improving pills.
They were,
Swift Feet pill: this pill decreased a person's weight for a limited time and made them move around faster.
Spirit Enhancing pill: this pill helped people in the self-tempering realm overcome their bottleneck when trying to break through from one realm to another. This was the same pill that Kong Yuhan made when he first met him. He had also learned the recipe for this pill thanks to Kong Yuhan himself.
The final pill that Alex made was probably one that Alex was surprised the most with himself. He didn't think such a pill even existed. Now that he did, he started wondering what other wondrous things you can do with pills.
The pill was called Face Changing pill. If you ate the pill, depending on the harmony levels of the pill, the pill would randomly change your face to a completely new one.