Which class’s ultimate ability do you like the most?

We seem to have strayed from the topic. We're talking about special abilities, not runes, although I agree that the Dwarves have a very good one. I was actually choosing between them and the Demons. And in the end, I chose the Demons because, no matter how you look at it, it's practically a two-fold increase in the army size, and it happens instantly. And, after all, the negative effect doesn't always trigger (meaning that with an initially successful attack, we'll have normal damage).