detect magic

For the duration, you sense the presence of magic within 30 feet of you. If you sense magic in this way, you can use your action to see a faint aura around any visible creature or object in the area that bears magic, and you learn its school of magic, if any.
Blocked by 1 foot of stone, 1 inch of common metal, a thin sheet of lead, or 3 feet of wood/dirt