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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, with golems or with tumblers?! They will be quickly defeated by enemy units. The whole point of the clever unit from the Warlock's side seems to be in the single, stealthy units with their invisibility: to attack, for example, with ranged units while the stealthy units are invisible... Or how??
Added 3 minutes later
And if there are creatures in the clever unit's army that are immune to "Unholy Word"?:D For example, gargoyles or golems? Or will there be no "Unholy Word" at all?