Arkanis is one of the temporary companions you get during Obe's Training. In Chapter 6, in the second level of the Candlekeep Catacombs, he and Deder will offer to join you as uncontrollable NPCs while you are on that level. If your Reputation is lower than 8 and you accuse him of being a doppelganger, he and Deder will attack instead.

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