It feels like something a witch would do. But it also seems like a specialty kind of item...

[He wonders if this all can be solved by just walking in and purchasing a potion. Wouldn't it have to be suited to counteract whatever his curse is? Is that easily diagnosed?]

I'm not sure how much of this world is based off of fairy tales or magical legends... a lot of it, but then... we've got Merlin on our devices. It's all very odd.