He is a Chaos Space Marines Lord. It came in the "Dark Vengeance" boxed game set only. The Lord Kranon model was originally painted red on the box cover but I wanted to go with black as the main color so the reds would be more vibrant. I created the base with a Chaos symbol on it. Made it glowing like he is drawing power from it through his sword.
This is fantastic! Favorite paint job I have seen in some time, You really elevated the classic red/orange/black combo. My favorite though is the molten effect on the base, it looks like more than just lava or metal but something corrupted and unnatural. Very fine work sir.