This is my one aura stack. It does require fairly high stats. My auras are 6k range with full void. If the auras aren't big enough to cover the big door south (the one close to the bridges), you will instantly lose. 

I use 1 tb, 1 guardian summoner (range + speed), the builder app, and an upgrade jester on first wave to upgrade, then switch him for a second guardian summoner that will buff DSTs. The first guardian summoner has to buff the 3 auras (ensnare, electric, strength drain) and 3 LTs. 

The healing aura is optional, it's just so that the heroes dont die from the rare snotball that somehow gets heroes despite the reflects (like once every 10 runs for me), but you could technically swap the healing aura for anything else. 

Move your builder app to hint 3. It's a completely safe spot and he/she wont die. 

After upgrading everything to 3 stars after the first wave, swap to your second guardian summoner to buff DSTs and AFK until completion. You can TB a second time when there's about 15 ogres left if you want to speed things up.