After all the starter hydra heads are slayed, the main head, ebon, puts on it's standard animation, yet it's not even on the battle board. Try after try it continually shows itself as visible yet has absolutely no way of even targeting it nonetheless seeing it appear as an actual tile in the battle again. And after you have no choice but to flee even with your companions still alive in battle it shows them as wounded. Makes it impossible to farm for those fangs.