The water servant is a classic water elemental, a 10-foot-tall creature made from living water. It has a discernible head, which contains a normal crab inside it that almost makes a 'face' shape, but the rest of its body bends and twists fluidly, forming strong tendrils.
"This creature has innate perceptiveness. It knows when to rise and when to vanish into the tides." -Jestus Dreya, Of Elements and Eternity