High Elves have the best chances against Orcs!
Elves are the most effective at reducing Rage:
Nymphs – affect three enemies at once.
Dancers – affect several enemies at once (usually three).
Prismatic Dragons – affect three enemies at once (luck is usually high).
Archers – reduce Rage with the first shot, deal heavy damage with the second, and also lower the initiative of the target.
Druids create a channel (this is, in my opinion, cheating).
Unicorns have a good chance of blinding (and that's dark magic!).
Ancient Ents create Forest Rage, increasing their initiative to 12, while the average initiative of the forest brethren becomes ridiculously high, and the Orcs get thrashed very quickly because they don't have time to build up Rage – their initiative is low compared to the Elves.