Activated Delerium
Very Rare crystal
This crystal has 10 charges. 1 charge: The crystals emits bright light for 1 hour. 3 charges: The crystal flashes, blinding all unprepared (consider a DC 12 dex save) in reach 6 for 1 round. When spent it becomes a beautiful gem worth 500gp.
The amethyst academy is exploring the process they think is happening to the falling fire worshippers.