Art by Dan "SMiF" Smith, coloring by Elizabeth "Me" McCoy.
This appeared first in the GM Pack adventure, Feast of Blades. Then, with some modifications, in the Infernal Player's Guide. Then I tweaked it to be a little closer to the description... This is a BIG picture! over 300K, and takes 2 minutes and 19 seconds to download on a 28.8 connection (according to PageMill's calculations). The picture displays smaller (and slightly squashed), but can be opened...