Thank you, Julia, for the reply. It's always nice to get feedback on an amateur's creations. As per your suggestion, I changed it to once per turn, and I've also gave him more spells and less unique items, and here is my first attempt at some personal stories to go with him:
Hokay, my goodness I made a difficult task hard with uploading those files. But I think I did so successfully.
Obviously the pass condition is pretty good, but I'm thinking not too good, as 15$ is a lot of money, and you could buy 2 spells and a unique item with it on your own. This just speeds up the process and gives him a unique item for free.
Any thoughts? Is it too overpowered?