The Outsider must behave as their rank dictates, until the potion becomes 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.
This method long remained the knowledge of a few: the church hierarchs were in no hurry to reveal it, and many outsiders rose blindly, paying for it with their sanity.