Nix

Nixes, also known as river devils, are magical creatures that dwell in rivers and lakes. They're capital is the Thalassyrinth; a three-dimensional submarine maze, filled with beasts and hazards, designed so that only a nix can navigate it safely to reach the towns within.

Redscale nixes are extremely powerful hydromancers. They can control the temperature of water, perform divination trough water, and even 'see' the dimensions of an entire body of water just by touching it.

When nix hydromancers perform divination, a grinding sound fills the air, like the noise of a portcullis gate's mechanisms churning. Theories to explain this phenomenon abound, but the most credited one is that the magically potent nix spirits in the next dimension - the Otherworld - are causing 'interdimensional friction' when trying to interact with the our dimension - Tesserlin.