Ankylosaurus

Better not attack this dinosaur found in the valley of Eodon. The Ankylosaurus can defend itself real well from any attacks with the thick knot at the end of its tail. Surprisingly, the Urai tribe has managed to make the smaller Ankylosaurus into riding animals, as proven by their prince, Darden.

Lore
''This low-slung dinosaur with the armored back dates to the late Cretaceous period (about 65 million years ago, up to the end of the age of dinosaurs). An herbivore, it moves about on four legs, defending itself with a massive macelike knot at the end of its tail. It grows to some 18 feet and weighs about three tons, making it about the length and weight of a car. I have personally seen one native man riding a smaller variety of ankylosaur, but as he was in the process of trying to murder me at the time, I failed to query him on his techniques for capturing and training the beast.''

- from "Ultimate Adventures Magazine", Savage Empire