Alternatively, on the entire opposite end of the style spectrum, a Lovecraftian-style transformation that you access by reading a crazy book or something (probably from the Seer) that gives you a bunch of different eldritch properties would be really interesting. It could do stuff like give you eyes where eyes should not be, fish features, monstrous claws, tentacles, and basically anything else you can come up with. Maybe don't even have the individual transformations work towards completing a set form, but instead have the TF randomly inflict you with a variety of different effects in order to pay homage to the whole "madness" thing.
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