Ring of Dances

(Stolen from item of same name in the Dark Age of Camelot MMORPG)
This ring allows the wearer to automatically Detect Invisibility in a 20 foot radius. Once per day the ring can fire a ray with a 150 foot range that causes the target spellcaster to lose 2 levels for the purposes of casting spells (range, damage, spell points, etc.) Save versus Magic to negate, lasts 10 rounds.