Board Thread:Lore Discussion/@comment-10561605-20130820164006/@comment-72.224.84.3-20160322190014

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Anyway, I've heard that Alduin is actually a godling, and his dragon form is just that, a form. He isn't actually a dragon, like how a dolphin isnt a fish despite looking like one. So his soul wasn't absorbed. Maybe he was possessing a dragon, and so that's what was absorbed when the Dovahkiin killed his mortal body.