Personality is a complicated concept. I have certainly known people whose personalities were mediated by mental disorders or the drugs they take to mitigate them. Don't get me wrong; I'm not suggesting that all (or most) personality stems from mental disorders or that mental disorders are necessary for creativity (not at all). In a game world, however, I don't particularly care about modern definitions, especially since the lines have changed significantly in my own lifetime and will, presumably, continue to change in the future. (The practice of retrospective diagnosis of historical figures creates a fair amount of controversy in medicine, humanities, and the social sciences.) I merely think that it could be interesting to play around with the concept of a deity who takes "cure disease" to another level, both more beneficial, and somewhat scary. It's a window into some of the thornier questions around genetic manipulation, injecting, if you will, a bit of sci-fi into the fantasy.