The Troglodyte King (Troggo) is a Troglodyte that leads the group that has taken to living in the caves inside the Mithral Mountains. He spoke of danger down below, and him leading his people up here where it's safe.
He is seemingly wearing a hat that enhances his intelligence but doesn't want to confirm this.

He challenged The Heroes of Thylea to a game of riddles which they won and he thus let them rest and shared the secrets of the mine, including the password to the Ellivaatour.