Discussion about Dungeon (Dark Elves).

Yes. When fighting against the Orc, you should definitely try to level up both Summoning and Chaos skills together. The Orc usually takes the Chaos skill, and it effectively silences him – it’s actually the best silencing skill.
And as the army grows and the heroes level up, Summoning becomes increasingly preferable to Chaos. I think this is obvious and can be proven mathematically.