I love fielding the Cauldron of Blood. Chariots benefit a lot from the Cualdron effect, so why not make a different kind of chariot for a Khaine army. I got my hands on 2 5th ed Cauldrons, and made one of these, a second one is in the works. The slaves were made of plastic parts from Empire Militia, Dwarfs, Empire Knight heads and a few zombie parts.