Build Description
Start on wave 22. I switch to 4 monks for wave 35 to get Spear Of Hearts.
Buff beam on the bridge with Reflectors and all other towers.
Make sure to place Aura stacks the way it can touch your buff beam.
Each Cloud tower is facing 1 crystal.
I'm using 4 Summoners with Guardian pets (3 apprentice, 3 huntress, 2 monk), I'm not sure if it's needed. I leave them under the bridge.