I agree about the Cyclops... But again, it all depends on how long you plan to play. If it's just a quick game, then Fire Ogres are also very good.
And about the 4th-level creatures - definitely, the MONSTER is the best.
When you have 100% magic resistance, lightning doesn't do much.
And you can pin a bird to the ground with spider web arrows! :D
But the MONSTER, it even sounds scary! :D A TANK :smile1