Or almost everything. Indeed, the one major limitation to healing is genetic conditions. As the information coding for genes is located in all of the cells in the body, real healing would require changing them
all. With the number of cells in an adult human estimated at several trillions, this is simply not possible even with a hoard of healers at one's disposal. The only thing that can be done in those cases is to mitigate the symptoms. It is common for healers who do not know how to treat a patient to reject the fault on an unknown genetic disease.
Another important limitation is the healers' own skills and knowledge. Throwing magic at a patient will have little effects beyond exhausting them more. The magic needs to be very precisely targeted so as to be used the most efficiently and actually improve the patient's state. As there is no proper school of healing in the empire, such knowledge is transmitted through apprenticeships. Collaborations between allied
Estates is frequent and a lord or lady sending their personal healer to help someone is seen as a very generous gesture.
While anyone can learn healing, having large magical reserve helps healers to be among the best of their professions. Similarly, having
line-gifts associated directly with healing or that can be twisted to provide some advantages will also do a lot in helping healers' skills but also their reputations.
This is a really fascinating and unique take on healing magic. I like the limitation with genetic conditions meaning you would have to change all of the cells, though also that's slightly scary. Really interesting article. :D
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Yes it's really sad that some things simply cannot be healed :( But I wanted to avoid having a miracle cure for my disabled characters even if ways can be found to make life more manageable