Disclaimer: This is a very safe build meant for players just starting to farm Sup+ gear. I would also recommend doing this build at a lower wave to get some trans if you're not there yet. I haven't tried it yet, but I think this build can sustain around 3k or maybe even 2.5k until you at least see a couple of supreme armor drop. Maybe not completion though because a lot of djinn spawn in the later waves. The main damage dealer tower here is the lightning tower, so try to get that as high as you can to clear out enemies faster towards the end. Make sure you also have enough aura range as what I have (2500) just about covers all the archers on the west and east side. Other than that, the gas should stop the djinn from desummoning and sharken rushing through, so your towers shouldn't get damaged as much or at all other than some splash damage.
The most important part is to take off your aura and trap gear before starting the wave. You won't be able to place the traps in the right place if you don't take off your gear, but you can place the auras fine. If you leave your gear on, your auras and traps will die from the crystal exploding, causing you to eventually die. Remember to put on your aura and trap gear after the other crystals die. Another important note on Hint 4, make sure to read it and follow it or that choke point will be wide open.
Hint 1: 5x archers each. Make sure the archers are a bit closer to the edge that's closest to the black hole in the map above. I put them a bit farther from the edge once, and an ogre managed to squeeze through and smack my LT and DST
Hint 2: 6x LT
Hint 3: the crowded place here with the mages and spiders, there are 3 mages, 2 spiders, and 1 archers on a 4 DU buff beam if you can't see clearly.
Hint 4: VERY IMPORTANT If you place the archers on the bottom of the little ramp here, they will die as they are too close to the bottom crystal when it blows up. The beams are fine, but the archers will die. Place them on the ramp on initial build, then after the middle and south crystals die, move them onto the buff beam.
Notes for fully AFK'ing this build:
I highly suggest getting a summoner with decent resist to survive if you're aiming to complete the map. On the summoner, you should have a djinnlet and Imp to auto heal your auras since a dead str drain WILL cause all your defenses to go down. I place mine right between the the mages and the crystal. It heals all the auras and traps from there. I also highly suggest placing a summoner with an apprentice and huntress guardian right beside the LT to speed things up.