Alchemy is a broad term. Like the word “remote,” it has many different meanings. It is mainly known as an ancient chemical science and philosophy aiming to achieve the transmutation of base metals into gold.
In this case, it is meant as the art of spiritual energetic transformation, creation, and reassembly;
taking heavier, less than beneficial energies and transmuting them into LIGHT, and
upgrading whole being = body + mind + soul.