A couple of Legend of Zelda inspired magic items. Let me know what you think!
The Dungeon Map
A blank piece of old parchment, rolled up and bound with simple string. These maps adapt to whichever ruin they are first opened in. Upon unrolling, thin lines of ink appear, giving the size and shape of every room in the dungeon, but none of the details.
A simple blue compass with a red needle that does not point north. When you use a compass for the first time in a new dungeon, roll+Wis. On a 10+, choose 2. On a 7-9, choose 1. The GM will mark them on your map (it need not be the Dungeon Map).
-the location of the most dangerous monster
-the location of a notable treasure
-the location of an important key