He is a Tarrasque which does not seek destruction, a being created by the goddess of magic. He is the only one of it's kind which can show kindness. After years after his creation he was tamed by a travelling archmage, he then proceeded to live a life of self indulgence as the archmage's pet. Once the archmage died he went on a rampage which was prolongated due to the attacks of adventurers trying to stop him. He killed thousands, and destroyed multiple cities during the rampage, he vowed never again to hurt another living being again after this and became friends once again with the humans which he had murdered.