Path of Potions. An outsider must behave as prescribed by their stage until the power becomes part of them. Until the potion is digested, the bearer is vulnerable: the power is already there, but mastery over it is not yet.
The path's craft roles: Apothecary prepares concoctions and understands compositions, Beast Tamer lives among animals, Potions Professor turns craft into science.
The method long remained the knowledge of the few: church hierarchies were in no hurry to reveal it, and many outsiders ascended blindly, paying for it with their sanity.