Scylla

Greek mythological monster that used to sink ships, it had a counterpart named Charybdis which is not in CV SotN. First you fight a snake head in an isolated room, then you run up a hallway that's filling with water and you get to this new horror. Be careful, this is a hard fight, especially if you aren't at a good level. The lack of a good long range weapon at this point work at your disadvantage. First, kill the heads with your sword or Holy Water by standing pretty far back and whacking away at the bubbles and snakesas they come close. Use your shield against the bubbles and jump out of the way of her ring attack. When the snake heads are gone, advance forward. If you're lucky, there could be a bug and you'd be sent BEHIND her when you get there. If not, then go under her and throw Holy Water along with Soul Steal and Summon Spirit (or Tetra Spirit).