You gain a 6th sense, the ability to see and feel the ebb and flow of the Weave around you. 

You gain proficiency in the Arcana skill, if you are already proficient gain expertise instead. 

This sense gives you Advantage on Wisdom (Perception) checks to detect hidden creatures or objects by sight if they are enchanted, or are under the effect of a spell, or have unused spell slots.

With a successful DC 15 Arcana check, you can get a relative sense about how powerful an item, or spell caster is (relative spell or caster level, if a caster has used up half or more of their available spell slots, the level of a spell used in an enchantment or magical effect.) A spellcaster can attempt to deceive the viewer by making a contested Deception check against their Arcana. 

This ability is blocked by any spells or substances which would block other forms of Divination magic.