I love the initial concept of a mischievous book, and the ideas of Axles how it could cause further ruination in the hands of non mages.
A none too wise adventurer may come to rely on it as "the book of answers" providing it continues to adapt its text to provide her with perverse advice on how to solve any current dilemma she faces in her adventures.
Looking forward to the finished sub!
Perhaps expanding the sub to cover a bit about their origins and if they arose through breeding with the fey using or some type of a wild creature they domesticated and changed through magic.
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Perhaps giving their paintings some kind of mystical properties could help, and detailing how they fit in with the fey culture as a whole?