The Shadow Killings, A collection of killings.

A shadow, lurks in the depths of hell. Only able to come out through the shadows in the corner of your eyes. At first, the shadow kills with its mind, not existing in a real earthlike form. But as it kills, it collects souls and can take the shape of any of the ones it killed. It starts to take on its own shape and form, becoming a demon that exists in both hell.. and earth.