It still might be a little unclear to you so i've written it up so you can see what the spirits want from you and what needs to be done. So here it is:
Basically you make up what the spirit wishes for. It could be finding an item that was lost for years and sends you all around the place searching for it in the world of Pandora. Or it could be something else. Just make it difficult. And in return, it will grant you your wish but first you have to solve the spirits wish before it will grant it. If you have any questions just pm me. :)