How to kill Black Dragons?

Yes, the question in the first post is quite specific. I was surprised. :)\ \ If we remove the requirement for the troop to be "lawful," I'd suggest a harpy. Not online, of course, but not too much of a hassle either. You can use it to clear out a small, enclosed area (4x4). Then, you can just let it auto-attack and watch the battle.

Why did I even get involved here? I just don't understand the saves. Wanderer, please, share the secret – why did your Chaos Druids start appearing in groups of three? Did you convert the saves from Equilibris?