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 dangerous to those around from the lowest stage: the Killer eliminates, the Instigator pits people against each other, the Witch already works with fate and curses.
The method long remained the knowledge of the few: the hierarchies of churches were in no hurry to reveal it, and many otherworldly ones rose blindly, paying for it with their sanity.