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

Luck and nothing but luck. Where will you get a skill that doubles the strength of your army? Not health, but strength! The enemy is destroyed much faster! So, Sylvan. And is it pleasant to kill a dwarf with super-duper bad luck? It's as if they get double health!! You hit once and it's as if you take out two warlords, but in reality, you only kill one... it's unpleasant!