Zephyra:
Only the Ertheia from the Spirit Realm may learn alchemy.
Because Alchemy creates rare materials, it requires rigorous training. You must complete your 1st Liberation at least to learn the basics of alchemy. Remember that!
Alchemy consists of Combination, using an Alchemy Cube, and Transmutation for all kinds of rare items. There is one more thing you will require, but you will find out when you are ready.