Allosaurus

The Allosaurus is a smaller cousin of the Tyrannosaurus of Eodon, but that doesn't mean it is any less dangerous than it. It has the same eating and hunting habits as its bigger cousin. It however has the handicap that unlike the T-Rex, its skin can be penetrated by normal weapons.

Therefore this big threat his to be taken out with distance weapons, or the adventurer ends up as a snack for this beast!

Lore
''The Allosaurus dates to the late Jurassic and early Cretaceous (centering on about 144 million years ago). It is a carnivorous dinosaur which moves about on two legs; some 40 feet long and 15 feet in height, it weighs (from casts I have taken of its footprints and estimations therefrom of its weight) about one and a half tons. The only ones I have seen in the valley have been solitary hunters, but the natives swear to me that they sometimes band together in packs to hunt down larger prey, such as the apatosaurus. I do not know whether these stories reflect the truth, or are tales designed to terrify unwitting outsiders such as myself. (In truth, they did manage to achieve that effect.)''

-from "Ultimate Adventure Magazine", Savage Empire