Put the Ogres on the ends of the buffs, spam as many mages/spiders as you like by the core. It doesn't matter if the spam dies as long as the Ogres live, and they normally will not cause any more than a poke of core damage.
2 full Trap stacks, 2 missing Darkness.
2 full Aura stacks minus Healing, Healing on the Core.
**Please Note**
This build is just meant to serve as a barrier for the core and can easily be changed. The real strategy comes from the DPS.