Rundle was Vendel's father.
Rundle spent most of his time with his son and reading books. Rundle helped Deya find Merlin as he is a good acquaintance with the wizard. Later on, he was trying to find his son, but then he saw his son fighting Gumm-Gumms. Vendel was about to be killed, but then his father sacrificed himself by blocking the way and died. Vendel went home and he saw the Heartstone staff with a note on it that says "Take care, my son".
Rundle looked almost identical to his son. Rundle was light tan with large horns and long, orange hair and a beard.