This build is a best of both worlds build I created after owls were nerfed again. Owls only became unreliable as forest ogres would linger at the phys beams too long and end up taking them down. However warden/squire only builds suffer from a longer combat time as they both have to wait for every enemy to walk within LoS of your towers. Owls only may still work if you fully upgrade everything, but this build only requires you to upgrade the buff beam. A true AFK and safe farm.
First wave build everything except mortars, bring out builder squire and TBER and start wave, then drop mana to squire to finish building while TBing, finally upgrade beam to max. Every wave after bring out a 2x rate boost summoner and keep TBer out. Final wave add in builder squire and guardian.
Black arrows show mortar direction, 3 each way. TBER stands at hint 2 right next to the NW corner of the crystal (this allows the TB to hit both phys beams and heal any chip damage they may take) and shoots at hint 3. Aiming for the pink flowers on the tree in front of you.