I think that there really needs to be a "Saurian" Monster, but it should have like an insectoid carapace, like the Perigrum Forma from E.Y.E Divine, but no arms, and a longer tail (Spooky, Right? Maybe put some eyes in too, one eyeless monster is enough)
Ability 1: Stomp. Stomp is a passive ability, whatever you run into that is smaller than you receives damage.
Ability 2: Stinger. There is a stinger on it's tail, it uses it to inflict low damage (Some poison damage over time, though) slow the hunter and cause hallucinations. I know that AI abilities are out of the question, so how about that hunter just kind of sees the Monster in certain places where it is not, and the monster is standing still, doing nothing.
Ability 3: Screech. Screech scares all wildlife and can be heard across the map. It does heavy damage to things close range but quickly loses damage the farther away you are.
Ability 4: Burrow. The monster burrows almost entirely underground, only the top of his Carapace is showing. Damage is deceased by a factor of two and speed and speed is increased. The monster cannot do damage unless he taps the ability button again, which sends him flying out of the ground, carrying anything above him with him doing heavy damage.
Traversal: The monster growls lowly and a bunch of veins start pulsing yellow. Speed increased two fold. Really good for escapes paired with burrow.
Feedback? Ideas? Criticism? Salty Tears? Oh yeah, and I thought of a name, "Worm Rex" Or something.