Galekittens were a creation made by an ancient. There's a quest or two where you deal with one. They were some kind of warning system. Tempered are partially unsalvagaeable. Anyone who had physical alterations to their physical form aren't save able. It's why people who were transformed into sin eaters weren't treatable. Unless you're going to say the average denizen of the 13 always looked like imps and ahriman. Which we know isn't the case.