Alchemy can be described in three ways:
( a medieval chemical science and speculative philosophy aiming to achieve the transmutation of the base metals into gold, the discovery of a universal cure for disease, and the discovery of a means of indefinitely prolonging life.
{ a power or process of transforming something common into something special.
{ an inexplicable or mysterious transmuting.
The setting is what your character is unsure about. They have been told that the world has ended, they have been stripped of any devices such as weapons or technology they might possess. They have been captured by an unknown nameless group to help them further their study of alchemy. Your character finds his or herself chained inside a simple 3x3 cell with their ankle shackled to the iron bars keeping them in. Their memory comes and goes, they see flashes of light, smell smoke, taste blood but for the most part, they can't place the memories down to one single event. Your character has been selected for his or her special traits. If they're smart or handsome or strong or gifted in some other way like dance or singing, any unique talent could attract the eyes of this dark cult seeking to use the power of human decay to their advantage. Your character is suddenly taken out of captivity and led down a hallway and pushed into a room where they meet several other foggy eyed individuals. The doors lock and the group is trapped and then instructed to make history happen.
Each individual has a marking on their back: either a circle, triangle, square or hexagon.
Each shape represents one basic element: earth, air, water or fire respectively.
The individuals have been tested for the past 18 months, their skin, their soul, has been branded with the mark best suited to them. Their blood, their flesh, their bone, their anything will activate an alchemic reaction if imprinted on any surface: human or inanimate. The black cloaked group has tested the compatibility with various elements, some mesh well while others do not. As your character looks around at everyone else's naked form, it becomes clear just what kind of testing has been going on for the past year and a half. Chunks of flesh, twisted limbs, and other serious injuries have been inflicted upon one another. The lost group is then informed that if they complete one final test, that they will be released into the world which they had been originally told was gone. There is one single knife tossed into the room as the groups looks on from above with interested eyes. This was what they had all been waiting for.