The method remained the knowledge of the few for a long time: the hierarchies of the churches were in no hurry to reveal it, and many otherworldly ones rose blindly, paying for it with their sanity.
An otherworldly must behave as prescribed by their stage, until the power becomes a part of them. Until the potion is digested, the bearer is vulnerable: the power is already there, but they have no control over it yet.
The roles of the path are creative: the Planter cultivates the land and grows crops, the Doctor heals people, the Druid lives in harmony with nature, not on top of it.