Stats listed are my stats, lower stats may or may not work. With higher stats you might be able to make do without the pylon or the reflect walls. 
Stack the warden towers on top of the crystals ensuring that the buff beam has line of sight to buff both the golem and towers.

TB on Hint 1 (On top of the Golem) and spam projectiles down a lane of your choosing.
Guardian Summoner (I used App Huntress) on Hint 2 (standing on top of the wisp dens)
Hint 3 is the safe spot I used for the heroes your leveling, jump onto the island and stand in front of the large crystal so you don't get sniped by djinns, the jump might not be possible for your slow heroes so bear that in mind.