Board Thread:Lore Discussion/@comment-26501222-20170712150344/@comment-31224266-20171006015612

Part of me has the mad idea that Numinex did go to the Shivering Isles, but when Akatosh decided it was time for the Last Dragonborn, he took Numinex from the Isles, and used Numinex' soul for the Last Dragonborn to be born with. Then again, I have a playthrough with this idea, but Alduin tried to call the dragon, like he did to the ones the Blades killed (it was never said WHEN Numinex died), but since Numinex's body was split up (hello dragon skull over the Whiterun Jarl's throne), Numinex did not return as a dragon, but as a dragon soul in mortal form. As for the Shivering Isles DLC, maybe Numinex was occupied in regions of the Isles that the hero was not in? Or Numinex was too far gone to be of help. And then during Sheogorath's quest in Skyrim, it seemed pretty straightforward and simple, so maybe Sheo happens to like Numinex's soul or even encourage the challenge to potentially heal the DB's soul into becoming more sane?

This is all B-S head!canon thoughts that I put together to try and make sense, there is absolutely no proof of this, but part of me really likes the idea of Dragonborn running around with the soul of a crazy dragon, and the question of Numinex's soul's final destination has bugged me.