I'm currently working on an Arabian Nights themed Dresdenverse game, and have hit a stumbling block with djinn in that it contrast to the "mortals have free will, creatures have a nature" theme, it's an important part of the folklore of djinn that even the most powerful do have free will. For the most part, I've sacrificed the folklore to the mythos, but nevertheless, I'm looking for some ways to push the line a bit. So far, I have three approaches, and am looking for second opinions.
The Wish:
A portion of a djinni's power that it can only use by giving up its free will and ceding that power to a mortal's will instead. Unlike modern takes, this does require that the djinn play fair with whomever makes the wish (that's more in keeping with the folklore I've seen in fact - when djinn were malicious, they'd just attack people rather than offering a wish and twisting it - when wishes were twisted, it tended to be a punishment by fate on a wisher who'd proved they didn't deserve it, rather than by the djinni). The djinni can carry out a wish so as to add stuff it wants to - eg if it wants an underground palace, it can find someone who wants an overground palace, get them to wish for it, and dig out the former to provide material for the latter. And the wish will be flavoured by the djinni's nature unless the wisher specifies otherwise - eg an Ifrit will grant wishes in a fiery way, because it wouldn't think to do otherwise unless told to.
I'm not sure how to render it though. Should the wish be a discount a-la Item of Power or Catch, or should it be a power that grants access to several extra Refresh not normally available? Or something else?
Ruled by Passion weakness:
Essentially a weakness that means refusing a compel costs an extra Fate point over normal. Meaning it can't be done as often and needs more taken compels to catch up. Makes free will possible but taxing.
What should that give back in terms of Refresh?
Passion stress track:
Not compatible with the previous, this adds a stress track similar to Feeding Dependency. Using the linked powers causes stress that can only be alleviated by acting out according to the djinni's nature. Makes free will possible, but exhaustible.
What should that give back? And how to handle alleviating the stress and consequences? Compels without Fate points or something less obvious?
Lastly:
Not to do with free will, but how would you cost a power that lets you apply the "with evocation's methods and speed" to a mundane skill? Eg Craft, where rather than conjuring the aforementioned palace out of thin air, you build it mundanely, but impossibly quickly.