Orks don't seem to have honour, per se or a sense of universal fairness to twist. Slaanesh couldn't tempt an Ork to greater depths of obsession, I don't think. Some like to go fast, or build big machines, or perform horrible surgeries, and they all love to fight. Greatbigtree wrote: Orks, for example, do not seem to pursue excess in the same ways as humans. If your existence is to pursue war, then having someone betray you is kind of a gift. Even revenge probably seems like a foreign concept to an Ork. They're innately selfish, self-serving creatures, that place no value on selflessness that treachery is anything but the expected course of action. Not even pride, really, just enjoyment of their activities. Orks, for example, do not seem to pursue excess in the same ways as humans. If that is the case, many non Eldar / Humans could potentially overcome the temptations. Presumably, the stronger the soul, the more enticing it is, and in turn likely provides more leverage for the gods to work with.
Chaos gods are 'fuelled' by warp energy, and try to draw souls to them.
