For anyone random reading this, it's just a plan for my friends and I. 

Notes:

• Be careful where you stand. Do not stand anywhere near the crystals when you have aggro of ogres. The brown circles on the ground around the crystal approximate the attack range of ogres.
• During boss rush, if you have aggro of one of the demon lords, try to face them away from the minions so they don't get hit by the fire ability.

G

• Ranger - Place 4 gas traps surrounding the crystal. Use remaining mana to upgrade beams > auras > mages > spiders > archers. Focus on keeping aggro of ogres away from the crystal. Call for help from AH if needed.
• Jester - Potential other option depending on DPS difference. Wheel O' Fortuna 3 swords aggros all ogres on the map to you.

A

• Monk - Place lightning, slow, strength drain, healing auras
• EV - Connect G's traps with buff beams.
• Summoner - Surround crystal with circle of minions for as much as time allows.
• Barbarian - Kill bosses, G watches the map and calls for help if needed with ogres.

B

• Monk
  • Channel Hero Boost (3 on the keyboard) as much as possible, maintaining mana by firing chickens to trigger your genie. The longer you channel, the more mana will be drained per second.
  • Only repair things if completely necessary, because any downtime not firing chickens will likely deplete your mana and put hero boost on a 20sec cooldown.
  • Depending how long the round runs, you might run out of hero boost. If this happens, just reactivate it when it's off cooldown.
  • Focus on staying alive above all else. Keep an eye on your health. If you get low, use your self heal. Staying alive is more important than channeling hero boost.