There is a unique bond between the beast and his emperor, which started when the Wood Elves gifted the emperor a griffon egg in 2503 IC, taken from the highest peak of the Grey Mountains.
The unique, tiger-striped griffon favoured by Emperor Karl Franz I as his personal mount and the greatest Imperial Griffon. It is a variation of an Imperial Griffon. Deathclaw is a flying monster mount for The Empire, unique to Karl Franz.