Fighting In Shadows

Darker - A creature that can control Darkness and shadows. They can drain the light from a lightbulb, and depending on their bloodline, they can even take the light away from somebody's soul, and replace it with the darkness that they willingly hold inside them.

Sketchers - Hybrids with a mix of demon, angel and human in their blood. They were trained to kill Darkers ever since they were three years old. They have a bad attitude, and are deadly with holding just a knife. They feel no regret after killing a Darker. All they want is for the Darker race to be extinct.
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Sorry, not good at making blurb things, but I'm pretty sure you will enjoy this novel ^-^