Tarrasque

The Tarrasque is the common name for a massive, ageless monster that haunts Stildane. The Tarrasque is a true terror: it is incredibly violent, endlessly regenerates, and reflects magical attacks. It is shaped like a great wingless dragon with a carapace, mottled grey and amber. It is known to appear suddenly and without warning, and to vanish just as quickly. It is difficult to predict the Tarrasque's behavior.
Scholars of chaos magic believe that the Tarrasque's iconic, draconic form is only one of its shapes. Before it was a monster, the Tarrasque was the legendary druid Kamdra. It may act feral and seem like a simple threat, it has inherited and amplified the immense power of its old life. Kamdra was perhaps the most skilled mortal in transformation magic, so it would make sense if the new form isn't as simple as it seems. 
The Tarrasque has repeatedly devastated the Sanctuary of Uvasten, regularly raids the Kingdom of Verzavek, and rampaged through the Eastern valleys of the Kingdom of Hain in 1910. The Confederation of Vershon in the Eastern chaos wastes has made a public mission out of hunting the Tarrasque.