Discern the Arcane

Your mind and vision becomes attuned to the arcane, allowing you to see the magical incantations and movements of spell casters. You also gain a superior insight into what spells are being cast by those around you. You can now make Arcana skill checks with an extra stack of proficiency. You also gain advantage on perception checks to notice creatures casting spells or using magical devices. 

At higher levels: When you cast this spell at 2nd level level, you can concentrate on it for 30 minutes. At 3rd level, 60 minutes, at 4th level, 120 minutes. When casting this spell as a 4th level spell or higher, you gain advantage on all Arcana checks while maintaining the spell.