Your vision glows faintly with ethereal radiance. For the duration, you sense the presence of magic within 30 feet. 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 learn its school of magic, if any. The spell can penetrate most barriers, but is blocked by 1 foot of stone, 1 inch of common metal, a thin sheet of lead, or 3 feet of wood or dirt.