Serum of the Seraphim
This is the most powerful medicine known to the occult and can cure anything but death once it occurs. The serum is so potent that only a few ounces are needed, it is usually kept in tiny ornate containers holding just a few ounces.
Any character drinking this serum is instantly returned to his full Health points and has all of his wounds healed. Any magical fungus, physical curses (like blindness), or diseases are held in check, then slowly cured over a few days time.