In terms of strength, in my opinion, the Knights (I mean, not just knights, but the Knights of Darkness! :)) are the strongest. Or at least, they share first place with the Nagas. And personally, I like the Cyclops more... judging by my personal experience (and this poll), they are unfairly underestimated. They can sometimes surprise the opponent in an unpleasant way. I also really like the Champions; they seem to be the second strongest creatures of level 6. Although, being humans and, accordingly, always having high morale (a human – that sounds proud! :D), they can also, under certain conditions, become the strongest striking force. As they say in taverns: "Let your Champions impale the enemy on a spear. You'll like it..." :)