This works with
Apprentice (1400/4300/2450/3501)
Ev (1364/5876/0/0)
Monk (2800/3000/3500/3000)
Summoner (3000/4500/2000/2000)
Damage Monk between the rounds with these Hero Stats (2300/4000/1500/1700) + Mega Chicken with at least 30000 damage and 6 attack speed. 

First Round: Place Areas, Stack 2 Lt's in the middle of the buff beam and 2 Dt's on the right (aiming north and south-east)

Second round: EVERYTHING ELSE (Highly recommend 2 players, one who defends against ogres on the northern core while in battle and helps to build in building phase)

Boss Wave: (Boss spawns at X)
3/4 Archers will go down almost instantly, but you need to stay on the Lt's with your buff aura and mega chicken (to defend and buff the towers). If you get low on mana, grab some of the ogres on either side of the minions. Do NOT turn the tower buff aura off at all. If you're playing with a friend, he needs to play with a attack speed buff pet and play ranged damage. You can turn hero buff on and off as much as you'd like!

Add summoner archers to block the bridge and place 3 mages on each side. Take one reflective beam and put it to the right minion wall, to block rockets coming out of the spawn. Upgrade the 4 minions closest to the spawn to one star before the boss spawns. On the west side upgrade the most north minion to 3 stars and the others to at least level 3.

You should be done placing the defenses at wave 2, switch to dmg monk to upgrade. Stay at the spawn, which is closest to your minions until you killed the mech every round (The mech shoots rockets through the walls of the spawn). There will ever only spawn one mech in that spawn and it's always the earliest in the round.
Upgrade Buff Beam, then Lt's, then Dt's, then lvl 3 ALL the mages, then the important minions and then everything else.