I got to thinking about these two the other day. Is there any lore that explains how they came to be?
From what I recall in my RoP, Shadow Dragon seems to be a bit of a mystery, he just suddenly appeared around the time the school fell to the WA.
The Entombed Will I got the impression was a Lunus dragon (Helians dislike him, and Lunus seem to revere/pity him), who did something or failed to do something and was punished for it. Any more information for either of these two?