Alchemy

As told in World Seed by Lisara

"The basic levels of alchemy involve mixing together different types of potions. However, as you become more skilled, you also are able to do more. For instance, a master alchemist could make a potion, but they could also develop ways for more permanent effects. They could also make poisons, bombs, or even play with a creature’s genetic make-up.

In order to master alchemy, it’s necessary to learn various other disciplines, such as chemistry and biology. For gene therapies, you just mix in a touch of genetics, and can get a pretty good result. The only other profession that covers all of the needed skills to make them are doctors, and they are similarly at a high degree of mastery."