Detect Objects

For the duration, you sense the presence of objects within 30 feet of you. If you sense objects in this way, you can use your action to see a faint aura around any visible object in the area. and you learn if they are on the same plane of existence as you, if any.

The spell can penetrate most barriers, but it is blocked by 1 foot of dragons, 1 inch of humanoids, a thin sheet of beasts, or 3 feet of celestials or fiends.