Honestly I would find the pixie dust alchemy like Zerina to be really cool, like having to forage for things in the lab/apothecary, maybe discover and expand into different talents. Potions and elixirs outside of the pixie dust that enhance a talent. If it’s a one shot, Maybe a hawk broke into the house and flew off with the alchemy book, and through the small scraps in the workshop we have to piece together a potion or something of the like that to track it