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
English
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Also "Mara" said "O Brother Mine" which is very similar to the Ahamkara's signature "O bearer mine". Though, I will admit, Riven doesn't look much like a dragon.
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That wasn't Riven, it was more like a messed up servitor
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<The Chimera was not Riven. Riven is more grand and if her theme, ambient or otherwise, has anything to say about her, it's that I really need to hone my long lost Skyrim skills.>
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If you are referring to the boss after we find uldren that was not Riven himself. More like a servant. His name was voice of riven
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And Riven's full title is Riven of a Thousand Voices. AKA the raid will be full of them.