You and your two mates are out for a walk and see a place called 'The Transformation Pharmacy'. "Hey guys" You call out to them, "this place here looks pretty cool - why don't we see what they've got."
"C'mon mate, it's a pharmacy - what do you think they could have?" Charlie asks. "I don't know, but I don't think it's any old chem store" you say.
"Fine" Sam says, cutting in. "That settles it, I guess" you say to Charlie.
You were right, the Pharmacy looks way different on the inside. The weirdest part was that on every shelf were bowls full of pills, each pill seemed to be coded with letter's.
"Excuse me mate, what do these pills do?" Sam asked the shop clerk. "They do all sorts of crazy things - for specifics, consult our Magi-pill instructions" the man replied, handing over a large piece of paper, filled with instructions on what all the letters mean.
"Let me look at that" I demanded, grabbing the instructions out of Sam's hand. As I studied the piece of paper I managed to work a few things out: One thing was that each pill had three different tiers to their uses, the first tier is 'what type of changes you want' - this only had two choices; body modifications and total body part transformation.
The second tier was 'what theme of changes you want' - this means what sort of species/gender you wanted to transform into (For body modifications, it means what you want parts/your whole body to transform into - for total body part transformations, it means what form of body part you want to transform into e.g. female breasts, male penis, lizard tail etc.)
The third tier was what body part you wanted transformed (or in the case of total body part transformation; what body part you wanted to transform into). With these instructions, you could theoretically transform into anything you wanted.