Nergaoul, The Thrill

Sudden urgent intrusive theory:

Nergaoul, The Thrill, is still down there at the bottom of the storming ocean somewhere... The Blackthorn now holds all of Dalinar's memories, while being animated - Unmade - by the very power of Retribution. He will have spren and Fused under his command capable of plumbing the depths of the sea, as well as a Crystal Inquisitor capable of seeing raw Investiture. Who knows, maybe the Blackthorn himself won't even need to breath 🤷‍♂️

We've already seen a trapped Unmade set free from a perfect gemstone. We are going to see another in the back half of the Archive. Nergaoul, The Thrill, will be released upon the peoples of Roshar once more, and perhaps later upon the wider Cosmere, as Warlight powers an unholy crusade of Retribution.