Build Description
Place the harpoon at each side first, then add the buff beam in front so i just touches it, then place 4 archers front and then a mage and spider behind, everything can be on the buff beam.
Place the monk auras on the corner os the steps so that they together will cover the harpoons that takes goblin copters aswell.
With this build i started in full godly gear (around 500-600 stats) and managed to get to wave 20 first time without mixmode, second time i beat it and hat gotten lots of stats