This build has been tested with 5k main stat heroes. It is made to be as safe as possible especially when your tower boost goes down.
Build Note 1: The gas trap is to buy you time during the genie onslaught. Build Note 2: The refelct beams are there to protect your towers and Tower Boost Monk from spiders. Getting webbed and not paying attention is the reason for most of my failed runs.
Wave Note 1: I stop tower boost at mob count 1800 and then start the tower boost after cool down to handle the final Genie/Sharken rush. Wave Note 2: I used a tower boost monk, two Summoners with Apprentice and Huntress Guardians, and the builder Warden.
Hint 3: I put my builder Warden on the back of a park bench at hint 3. It may seem unsafe, but noone bothers your builder here and I was was able to make it through all waves without dying here. Hint 4: My Tower Boost Monk stood on the crystal and shot at hint 4.
Arrows
Blue = Cloud direction
Green = Seed Bomb and Sludge direction