Aquarius and Glacier are an Ice/Water set of the 50 Immortal Fangs.
Aquarius was created using a body part of a dangerous aquatic beast that had the ability to control water. They fashioned it in the form of a ring designed to look like a water serpent, with a sapphire (supposedly the creature's eye) embedded into the mouth.
The user can control any liquid around, including water and blood by simple hand gestures. However, it only functions in the presence of water or any other form of liquid around. Oftentimes, the water takes the shape of serpents or dragons.