An item, ability, or spell that when used provides the player with otherwise hidden information about the current enemy. This will often reveal the enemy's Hit Points, Mana Meter, attacks, weaknesses (in RPGs, especially magic-based ones), or may just provide a general description of the enemy. Often shown in the form of Stat-O-Vision, even if it's a magical spell. This may or may not work on bosses, especially the Final Boss. But it usually does work on Helpful Mooks. Can become a Useless Useful Spell if it can only scan weak enemies you don't need to know much about to defeat.