Detect Magic

Casting Time: 1 action
Range: Self
Duration: Concentration, up to 10 minutes
For the duration, you sense the presence of
magic within 30 ft. 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.
See PHB, pg. 231