First-Rate Power Potion

"A mysterious medicine that greatly increases the power of those who drink it. Since the effects are permanent and affect not only the body but also the drinker's magical and mental powers, it appears to work by drawing out and realizing the future potential of the drinker when imbibed. It is rumored that the White Laboratory is involved in the creation of this and similar medicines, but when asked to provide confirmation, the laboratory's director responded with a knowing smile and nothing more."