The Marauder’s Map (item)

A magical map that shows the layout of Hogwarts and the location of every person within the castle. It was created by four Hogwarts students, known as the Marauders, and can only be revealed by saying “I solemnly swear that I am up to no good.” The map was hidden in various locations and was protected by various spells and tricks, such as the spell “Muffliato” which makes it impossible to hear the conversation of the person carrying the map.;