The Otherworldly must behave as their stage prescribes, until the power becomes part of them. Until the potion is digested, the bearer is vulnerable: the power is already there, but there is no control over it yet.
The roles of the path are service-oriented: the Sheriff maintains order and detains violators, the Investigator conducts inquiries and extracts the truth, the Judge makes decisions and is responsible for them.
The method remained the knowledge of the few for a long time: the church hierarchs were in no hurry to reveal it, and many Otherworldly rose blindly, paying for it with their sanity.