Detect Corruption

For the duration, you can sense the presence and location of rot, poisons, diseases, curses within 30 feet of you, as well as the presence and location of deeply unnatural forces such as aberrations, fiends, and undead. You also identify the kind of corruption or creature in each case.

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.