My only problem with this mechanic is that it seems buggy. First, the conversation not always happens. Second, you can have several items that might qualify for that, but you can't choose which one to offer. And you can offer all of them in one go, instead of having a timer or something that indicates that you should feed him another item. I think it would work better if you can offer any blue or higher item and have some indications of Gale's state and need for more magic.
Also, main characters with arcana, should be offered the opportunity to study Gale and, maybe, find out more about his condition. Make it easier to treat or handle or, getting some insight from it. And yes, even explain Gale things that he got wrong. Just saying.
