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Take the teleporter in the east in the main room to a room where, if you step on a crack with the Diamond Revealing Scroll in your backpack, you'll remove a wall and find it.
You can buy it from the Magister of Magic but you might have to camp out outside his door for a bit as the frequency of its appearance there is 5 as opposed to 10. He's in Cymbria Village.
It's in the Mideast of the Shrine of the Triple Goddess.