You yourself wrote that it refers to level 28. So, Chaos fits into your scheme...
I don't understand something: which clever unit are you talking about, the one with golems or the one with tumblers?! They will be quickly defeated by enemy units. The whole point of the clever unit, from the Warlock's perspective, seems to be in the single, stealthy units with their invisibility: to attack, for example, with Armored units while the stealthy units are invisible... Or how??