He is entirely black and white, with reptilian eyes, 3 horns on his head, and retractable snake-like fangs and lots and lots of teeth. His body is covered in both plate armour and fur, and his wings are composed of a combination of black sinew and white skin. His tail is very long and has black razor sharp spikes running down the length of it. He also has armor plates running along his belly. His neck has a lot of glowing coals and has 3 row of spines running along it. A rather clever and powerful beast in the end.
This image shows him sketched and also in colour - he has an unsettling white hue to his skin that almost glows, and his eyes are like fire themselves. He has a very cruel looking smile. I have other images that show the full image of him but this one focuses just on the neck.