Start out with Aura Monk - get top east chest then drop down to bridge to get second chest.

Build Auras on east and drop down to get middle chest and go to west crystal and build Auras.

Open last chest before returning to forge.  Drop mana on way at buff beam build location.

Switch to EV - build buff beam - (2) 1 DU reflect walls in front of buff beam - 5 DU Physical wall in front of reflect walls....  make sure the wall covers all of the buff beam

Now you can build the last (2) 1 DU reflect walls at the end of the bridge and one offset farther back - this helps with stray spit balls that sometimes make there way to the towers.

Now drop mana and switch to builder app - build (2) LT on far west side of beam - then build (2) Fireball towers on far east of beam - aim one so it covers the east crystal and the second so it covers the walkway heading to the west crystal, this is for the wyverns.

Now bring in the TB Monk and stand on fireball towers and start the first wave.

Drop mana to the Builder App to finish building out the app towers - first the (3) DST's beside the LTs - (2) pointing at the west crystal and (1) facing boss spawn - then build the last (2) FTs both facing toward boss spawn beside the DSTs.  Up buff beam with remaining mana

Second Build phase - switch to huntress and drop the oil trap, be sure to touch the east side of the buff beam, then drop one gas trap on the west side of buff beam being sure it covers the walkway below, jump over to the west crystal and drop one gas trap on each side of the crystal and upgrade the auras to 3 bars each.  No need to upgrade the gas traps and depending on aura health u may not need to upgrade the west auras again for the reaminder of waves.

Switch to the Knight and build the Mortar between the fireball towers.

After completion of build switch to an initiate for more boosting and speed running the waves.  I use the initiate to upgrade the towers on first few waves, just be sure to upgrade your towers to help take down the boss faster.  Depending on stats you may not need to initiate boost until boss.

Last wave just be sure to bring in your splits and have full mana at end of wave on both TB and Initiate, double boost.  Towers will take down the boss.

This is not the fastest build but it is very safe as long as your fireball towers are placed correctly on first build phase.

If your stats are lower, 4-6k, you can add in minions, mostly spider queens on each side of west crystall and one at end of bridge one east crystal.