IDEA !
Give it immense hull strength, enough that it would take forever to pound it to death (because weapons are useless against solid Neutronium), but put its warp core at the front in the mouth so you have to shoot in its mouth in order to kill it.
you could name the worp core something else and still give it a lot of strength so that even while attacking it at its weak spot, it will take a beating to kill it.