Deinobrontus

Discovery
Before the siege of Bardonia City a farmer stepped on a bone. At first it was thought to be a tree at the sheer scale of the fossil. It is the first hung, named, and described fossil. At first it was described as a large, wingless dragon. The fossil was so complete that the paleo-art of the creature was accurate enough to be used reasonably. The head miraculously survived the siege but was then was stolen by goblin bandits that ate it.

Evolution
The early members of sauropoda evolved a large nose to show off, but this trait existed in both genders. Muscles randomly mutated into the nose as it kept getting larger. The first truly trunked species was still small, but then the local camarasaurus went extinct and the sauropods rapidly increased in size until they became larger than the camarasaurus. They are the confirmed largest land animal ever, and they have evidence of fighting. A lot. The only adult fossil have 18 spur scars on the bone. They would likely have been nearly invulnerable as an adult, but the smaller individuals would have been under threat by Maip Macrothorax.