I'd like a Chaos General with some speed (say Shadowrath speed), and they have a special area ability like Spearos, but instead of freezing, it poisons everyone in that area.
That way you can run deep into enemy territory, and poison a bunch quickly, also because Chaos units need some speed (though we have have units like the crawlers coming to fix that).
Side note, shouldn't there be a Chaos Magician as well?

