That Which Slept
A massive, shadowy dragon with glowing red eyes, That Which Slept is a fearsome sight to behold. Well over 100 feet long with a wingspan of over 150 feet, That Which Slept stands over 20 feet tall. As such, she is one of the largest creatures on Oerth.
Since adventurers accidentally released her from her planar prison located in an abandoned temple of Celestian in Steelbone Meadows, she has taken up residence in the Bluff Hills for unknown reasons. Since her arrival there in 596 CY, and the subsequent destruction of Groucester and surrounding areas, none have seen her.