I've seen a few articles claim Riven is an Ahamkara, but do we know for sure? What gives me doubts about Riven being an Ahamkara is that the body/head look nothing like you would expect it to look like from the Ahamkara bones/skulls we've had on our armor. If Riven is a wish dragon, then why does the body bear such little resemblance to the shape of the bones?
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Riven is defrocked a wish dragon. Look at Uldren all through the story. Wearing armor and scales. Guardians know that even the scales can cause hallucinations and the dragons will whisper to the wearer and go mad. Guardians only ever wear a small piece and even then some coated the bones in silver to block the sounds