Arcane Sight

For the duration, your eyes glow blue and you are able to see the magical auras of spellcasters, magical creatures, spells, and enchanted objects within 60 feet. For creatures, you know the highest level of magic spell the creature can cast or a rough approximation of its power level (level within 1d6-3), as well as the primary class their spells are drawn from (if any). For objects, you know its relative power level (magic item rarity) and school of magic (if any). For active spell effects, you know the spell level and school.

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. Nondetection and Mind Blank fully shield the subject from this spell's effect (as with any divination spell).

Using a Higher-Level Spell Slot. The spell no longer requires concentration if you use a 5th-level or higher spell slot.

Adapted from the AD&D 2nd edition book Tome of Magic.