DDPlanner seems not to calculate the DU used in Pure Strategy correctly. This build takes 129/130 DU.

Build:

• The stats listed are not the required, but the ones I had when testing build.
• Build the buff beam on top of the "bridge" on the west side of it, at the edge, and the reflect on the east side, at the edge.
• Ensnare Aura should reach the Buff Beam with Nature's Pylon.
  • I am not sure if it will reach it by building it where it's listed. I placed it closer and later moved it with Jester's Move Tower ability to where displayed when I figured it was a better idea.
• All three damaging tower stacks go on top of the buff beam.
• Depending on your Warden stats, you may not need to TB, but it is faster if you do.
• Slight alternative build change: Instead of 4 Lightning Towers: 3 Lightning Towers + 1 Wisp Den + 1 Shroom Pit (130/130 DU used).

Waves:

• First wave: Upgrader + TB. Max towers during this wave
• Remaining waves: TB + Summoner with 2 Huntress Guardians
• Last wave: TB + Summoner with 2 Huntress Guardians + Summoner with Huntress and Monk Guardians + Warden Builder

Notes:

• Like mentioned before, the stats listed are not the required, but the ones I had when testing build.
• With high enough status, you don't need TB but it certainly makes it faster. With my stats:
  • Starting at first wave (22) with the heroes listed below was smooth.
    • Upgrader
    • Summoner with 2 Huntress Guardians (Probably was not needed)
  • Last wave (35) with the heroes listed below was successful. However, it seemed at times quite overwhelming - but it was mostly just djinns. The cores were never in danger. It would have gone faster with TB and I do recommend TB. Lower damage output or bad luck with djinns despawning an aura and taking the Buff Beam with it is all it's needed for game over.
    • Summoner with 2 Huntress Guardians
    • Summoner with Huntress and Monk Guardians
    • Warden Builder
    • TB (Tower Boost was not activated, I kept one hero as TB just in case)