New mob for Blighted Badlands

We already have a beast and cursed beast skull artifacts, we should get an new mob that isnt hostile, but stalks people. Deer-like style that fits in with most blight creatures. It appears 30-50 blocks away from the player and runs around. If looked at directly, it stares for a second, then like with another mob - grim pops out, but now with the cursed beast skull, host body falls and disappears.