Hydaelyn

For the duration, you sense the presence of portals, even inactive ones, within 30 feet of yourself. If you detect a portal, you can use your action to study it, making a DC 15 ability check using your spellcasting ability. On a success, you learn the destination plane and required portal key; on a failure, you learn nothing and cannot study that portal again until you recast the spell. 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.