The Detect Aura spell is unlocked at level 46 Detective by talking to Gallabast the Ragged.

Auras

What all the different auras mean.
Aura Name Description
Purple Stars Mysticae People with Mysticae often have magical apitutde, but it's not a combat magic.
White Lines Neutralae It's the most common aura. People with the neutral auras have barely any magical ability.
Blue Circles Receptacles They're a sort of magical blank slate. They have the latent capacity to absorb a huge amount of one magic type.
Black Skulls Necromae A nasty aura associated with death and decay.

Update history

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References