i dont know if it is because he spawned from Leah but check this:
compare him to this end boss from act II , i mean , look for yourselfs and tell me who is realy more terrifying:
even when the in game cinematic zooms in on him from slightly above..i can even detect ..breasts?
not to mention a wide heeps? is it the model skeleton and a reskin of the queen of blades from SC2 ?