In his dragon form, Osric presumably fled during Bowen's twelve years of dragon-slaying. He plotted a rebellion against mankind, and planned to rule the world. However, none of the other dragons agreed to follow him. After killing many humans, Griffin was captured by the dragon council, and as punishment for his crimes, his heart was removed and he was cursed to live as a man (the form he hates most). Griffin was then exiled and he took a new alias: Lord Osric of Crossley.
After reclaiming his heart, Griffin resumed his dragon form in front of the King's entire court. He attempted to persuade Drake to join him, but the younger dragon refused and challenged the elder one. Griffin quickly gained the upper hand and nearly killed Drake, but Drake wounded him with the blades in the tip of his tail, and Geoff threw a sword at Griffin. Enraged, Griffin prepared to attack again. However, Drake sent a blast of ice breath at the evil dragon, freezing him solid. The frozen Griffin fell to the ground and shattered into hundreds of pieces. Unfortunately, one of the ice shards hit Geoff in the heart and killed him, but Drake used his heart to revive his friend.
Lord Osric was just as malicious in his conniving form as he is when he was the evil dragon Griffin. He wants only to dominate the world and see to the end of the human race, by his own claw if necessary. He is seen to be manipulative and easily wraps Geoff around his thumb by offering him knighthood, keeping Drake as close as possible.