Detect Metal

For the duration, you sense the presence of metal within 10 feet of you. If you sense metal in this way, you can use your action to see a faint aura around any visible creature or object in the area that bears metal, and you learn exactly what kind of metal it is. If the metal is an alloy or ore, you can sense it as such and learn its largest metallic component.

The spell can penetrate most barriers, but it is blocked by 1 foot of stone, a thin sheet of any metal, or 3 feet of wood or dirt.