Arcane Sight

For the duration your eyes glow faintly and you sense the presence of magical auras within 120 feet of you. If you sense magic in this way, you can use an 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.

if you spend at least 1 minute observing a magical aura outside combat, you can learn certain information about its capabilities compared to your own. The DM tells you if the magical aura is your equal, superior, or inferior in regard to the most powerful spell level available to that creature or manifested by that item or phenomenon.   Consequently, while affected by this spell, you have advantage on Intelligence (Arcana) checks made to reveal information about a creature or object you can see.

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.