Return of the Moont

Moonts became the Treants you know after the war. The wholesale slaughter released countless evil spirits, not to mention the spiritual backlash of near-constant war corrupted the poor, innocent Moonts. Now we have Treants... I've spent years trying to revert a Treant back into a Moont. My purification ceremony should trigger the process. The last thing I need for my purification ceremony is a Bright Stone. Do you know about Bright Stones? They have profound magical properties, but they're hard to get. I've heard Bright Stones can be harvested from the skins of Horn Beasts.