Darkness in pencil. I just darkened the lines using Photoshop.
Darkness is one of the many awesome pieces found in ~gammaknight's gallery. His drawings are really fantastic and you can really enjoy the glorious details found in his comic works! (
The first and most interesting thing I see is that the character clearly is humanoid, but that there is a superficial skin stretched over a really primordial shell/muscular structure. Creepy and well done. Congratulations!