Thelashas

 was a young blue dragon that was bound by Halas to protect his manor. As an NPC, is played by Matthew Mercer.

Appearance
Thelashas was a young blue dragon with a rigid horn and pale blue eyes. Thelashas looked powerful, but surprisingly slender.

Halas
Thelashas agreed to guard a section of Halas' manor in exchange for treasure. He confessed to Fjord that one day, when he was larger, he would overpower Halas and take the entire manor for himself.

Quotations

 * "The smell of unfamiliar sneak-thieves finds us. The way is shut to you."