Adept Upper and when you finish upgrading the damage stuff, switch to Summoner with Huntress/Monk guard pets in front of Hint 1.
TB on the back end of Hint 2 aiming towards Hint 5 (black arrow). TB should be buffing the south aura stack as well to make sure the Electric Aura is killing off the mobs.
Summoner with Huntress/Huntress guard pets on Hint 3
Builder Guardian in a safe spot such as Hint 4.
Blue arrows for Cloud Tower directions.
Make sure the south Holy Bulwark is far away enough for the crystal (about even with the vases) so that the copter ogres from the south don't hit the crystal when they go to hit this Holy Bulwark.