The Black Ones are creatures that live in a forest and have a pool which turns humans into figures. The Black Ones have an instrument like Pan flute with no sound. When the some of the Black Ones play that flute they make the victim's muscles to contract and make him look like dancing. At the end of that painful dance the Black One grab him and throw him in the pool. After they get him out of it he is shrank and made of petrified bone.
The Black Ones are black tall humanoid creatures. They are taller even than Conan, himself. The have something devilish in their appearance. Their evil eyes and pointed ears make them look even scarier.