Old Goat (Enemy)

The Old Goat is a Tyrannosaurus Rex that lives in the bowels of a secret fortress filled with lethal traps. In the last room of the castle, the Old Goat has seemingly barricaded himself in a room where he writes in a diary and plots evil things. If he is tracked down and defeated, the player unlocks the "Old Goat" Mutator, and the Old Goat achievement. Old Goat Mountain, where he can be found, is named after him.