You will have mana to upgrade the TBBeam and the NPylon to 3 stars, and the NW and SW Darkness Traps to 1 star, before starting at Wave 22 or 23. Starting with 3 characters, Jester or Adept Upgrader and 2 Guardian Summoners, each with Huntress and Monk Guardians, you have to make sure the auras will get buffed to the NPylon and TBBeam, and then move each of the Summoners to their stack. With 2 stacks with 7 LTs each, and 2 summoners in, guarantees you that 6 LTs of each stack will be enhanced with the Guardians. The split stack will guarantee you wider activation range as well. 

Hint 1 - If your aura range is below 7K you just have to build them a bit closer one to each other, so that they can get buffed with the NP or the TBB.

Hint 2 - This is 2 stacks of 7 LTs at both ends of the 5DU TBB

Hint 3 - If your aura range isn't enough to reach a 5DU TBB you can build 6DU TBB and skip that Refl Beam... 

Hint 4 - When placing the Nature Pylon, note that it doesn't need to be on the TBB, place it where the Aura stacks can reach it and in the best scenario, the Proximity mine trap would be buffed by that NPylon. The Proximity Mine Trap there helps significantly with the Ogres and the Harbingers coming from NE and SE at later waves. 

Hint 5 - NW and SW Darkness traps are a bit distant, at well known locations, and are not likely to be desummonned. The center Darkness trap however is there because it covers the mobs coming from NE and SE, it works well and it is covered by the Auras and it is NOT going to be desummonned at any time. 

Current build takes only 48MU, so if your stats are, let's say 1K lower than the stated above, you have enough MU to strenghten your defense!... First when I started using this build my stats were more than 1K lower and with 2 more Spiders and 2 Mages stacked I managed to gear up nicely. 

The build was inspired by Washy's 9.0+ Infested build and Theoran's Infested Survival Updated build. Thanks to both of Them!

Steam - [ninja]vanio.ludoto 

Discord - domischief__