Detect Weapons

For the duration, you sense the presence of manufactured weapons within 30 feet of you. If you sense weapons in this way, you can use your action to determine their location and type (e.g. "shortsword"). This can detect an improvised weapon if it is wielded by a creature intending to use it as such.

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