>>26575663
One of the most fun items ever encountered was a magical fairy tale book our party found while tooling around and politicking in a city.
A wealthy noble has a terminally ill daughter. So, to try and make her as happy as possible, he commissions the creation of a cursed fairytale book. When she reads it, she gets turned into the appropriate character from whatever fairytale, temporarily, until she finishes the story or achieves the prerequisite for the character.
At least, that's what was implied. For us? We read it, the GM rolls a percent die for what fairy tale (using a list of real-life ones,) and then rolls a percent die for what character from the fairy tale. (most have =< 4 characters)
We then get transformed into that character, and left there until we get curse removed or accomplish the prerequisite. If you get turned into the lumberjack from Little Red Ridinghood, you have to kill a wolf/werewolf. If you get turned into a knight, you have to kill a dragon/rescue a maiden. If you get turned into a maiden, you might have to get rescued. You might have to kiss prince charming. Whatever.
So, given an artifact level device that had the potential to backfire horribly on us, what did we do? Handed it off to our trollbro cleric who used it for disguises when getting pursued by guards.
It was also responsible for turning my wizard's familiar into Sleeping Beauty. Except that was its last charge, so it broke, and my daemonic familiar got stuck that way.