What Is Nixie?
Nixie are spirits who dwell in quiet rivers and lakes in England, Germany, and Scandinavia. Their love of water is equaled only by their love of music, and their beautiful songs often draw listeners to the banks of their watery homes.

Characteristics
Physical Description
Each culture has its own take on the Nixie’s appearance, and the creatures themselves can’t seem to settle on one appearance either. They are avid shapeshifters and may appear as humans, merpeople, snakes, fish, sunken treasures, or horses.

In human form, they usually have an elegant appearance, although their features might hint at their wilder natures. Their ears and eyes are sharper than usual, and their hair and skin might be tinted with green or blue. In more extreme cases, they can have gills, bulbous eyes, and webbed hands and feet. Their garments, though stylish, are chronically wet around the hems.

When they take the form of horses, they are pure white or apple-grey. Though they are far more beautiful than average horses, they still bear telltale signs of their true nature, having manes full of river weeds or constantly dripping water.

Special Abilities
Nix are magical beings; there’s no limit to their abilities, they are very talented in all areas. 

These water spirits are shape-shifters. Seemingly, they can take on any appearance they want.

Their musical talent is beyond comparison. All of them sing sweetly, and some of them couple musical instruments with their already spellbinding voices. Their music is capable of hypnotizing listeners, and entrancing grown men.

When they’re in an animal form, Nix replace the charms of their music with dazzling physical beauty. As horses, they can hypnotize onlookers by prancing around, flaunting their manes and tails, as easily as they can when singing in a human form.

Weaknesses
Nix are magical, but they’re not invincible. 

There are several ways you can take on one of these water spirits, if it becomes problematic.