These monsters appear as FOEs in B12F, commanding the never-ending Bloodant spawning. As such, the only way to stop them from re-spawning is to defeat the Servants. They can be easily discovered, because they are the only FOEs that aren't moving. They are stronger than Bloodants and Guardants, with higher Atk and Def. If your party is not well prepared, these Servants can become a challenge. When the Servant of the zone is defeated, the Bloodants spawning point, as well as the very same Bloodants already on the floor, will disappear, until the Servant re-spawns several days later.