Enchantment auras can be added to equipment (that have enchantment slots) once you get to the enchanter, to the west of Lovis' tower and then north. You may already have equipment with enchantment auras on them. Jewelry can have a healing aura, for example, or armour a retribution aura. I had a couple pieces of jewelry a few levels earlier than that with a poison aura enchantment, which resulted in the demise of a few rabbits and chickens.
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