Be Careful, the Elements Are Fierce

"The locking reaction formula is: composite ceramic skeleton of carbon, silicon, and trace amounts of boron." "The trade-off is that high-density bones make the body incredibly heavy." "Or you could lock down the reaction to a single element: chlorine." "The price is: lifelong body odor and accelerated aging." "The reaction formula for hydrogen combustion seems good, but at what cost?" "Uh... Rheumatism, you'll have permanent rheumatism." "..." "Is there a reaction formula that is particularly powerful and has a small cost?" "Are you here to cause trouble?" "Of course not, I just want to see if there is anything that can bypass the law of conservation of energy." "..." "I'll give you this bottle. It's the X-series cultivation potion newly developed by the group. The locking formula is unknown and the price is unknown. It's completely random."