In my mind every one started in the lighter color dots of their respective colors. I would have the Titan(me) and Warlock fallback. The Titan would put himself at an angle so that he would have a field of fire on both the incoming hive and the big baddie. This would also put him in between the Warlock and all possible enemies. Titan would hold off the waves of hive and keep eye on baddie. The Warlock would fall back behind the Titan, basically using him as a shield. This gives Warlock time to charge up powers. The warlock would be responsible of beating back any hive that attempt to move around the Titans fire. Which is why the Warlocks field of fire has two directions. He has to alternate to keep the hive in a funnel so the Titan can just mow them down. Warlocks third job would be to keep the baddie at bay with powers and shots if the Warlock can spare them. Both hunters would fall back so that the hive would focus on the Titan and Warlock, who would be making a whole lot of noise. Once far enough back. They would either use sniper or assault rifle to join the Titan in killing the hord. Both Hunters would be at an angle to assist the Warlock in funneling the Hive to the Titan. The Hunter closest to the Big Baddie would also have to help the Warlock fend him off. If all goes well the Hive will be stuck in a killing field and the big baddie would have been forced to stay at the entrance of the temple by the Warlock and Hunter. The Titan should shield the Warlock enough from enemy fire that the Warlock can focus and use big magic. The Hunters would have to be cautious though. If they draw too much of the hives attention away from the Titan and Warlock they could run the risk of pulling the hive away from the killing ground and become isolated. But if it goes well I think this would work well by keeping the hive contained a small area with a lot of fire going into it. Also this would keep the evil thing back long enough for the hive to be killed then they could go after the evil thing