Thelthass is a Dragonkin mentioned in Kranon's Ancient Journal. The journal does not say anything about Thelthass other than them stepping into the shadows, never to be spoken of again.
- ^ Kranon's Ancient Journal, written by Kranon, RuneScape. "It is there in the tale of Vokun, who took a pebble and was no longer part of the legend. It is there in the hidden story of Thelthass who stepped into shadows never to be spoken of again. All of the stories, every last one, has a piece of the story left untold. A great network of forgotten and empty takes."