Iron filings and lodestone

Category: Gear
Price: 15 gp
Description: Watching for disruptions in the patterns that iron filings normally form around a lodestone can help you perceive strong magical forces. When you fail an Arcana check to detect magic on an object or a location, you can attempt the check again after spending 1 hour spreading and studying the iron filings. You must use the second result.

Published in Mordenkainen's Magnificent Emporium, page(s) 124.