You can build all Buff Beams, Auras, Shroom Pits, and the Mortars at Hint 1 & 2.
Starting wave the following characters should be out - TB Monk, Adept Upgrader, Squire Builder.
TB Monk on Hint 2 and mana drop to the squire builder to finish the mortars at Hint 3. Once mortars have been built you can take squire builder out. Hint 3 (1) mortar is facing East and West and the rest of them to the South.
Adept upgrader should start at Hint 1 and you can go to either crystal after that.
TB Monk at Hint 2 until boss wave then move TB to Hint 3 to assist with DPS App while Tower boosting/Hero Boosting for the boss kill.
Bring splits in for boss wave and make sure you check aura on east crystal if you have low tower health stats.