Nevermind, I got it done after. What I did was send all 3 npc groups east, and position myself to take out the west (warrior) boss as soon as he spawned. Targetted him immediately and fell back to the center bombard as soon as he was dead, letting his surrounding group chase me. By this point there will be a group already at the bombard, but you should have time to save it and fight off what's around you. I then took out the Paragon boss (middle left). If you're lucky they npcs will still have control of the east side at this point. With the center and west bombards clear, and the npcs still in control of the east side, I took the monk boss (middle right) out next. Right around now my npcs were pretty much wiped, so I took their position east and defended there. For whatever reason the waves seemed to become more frequent, perhaps because the other rifts were closed. There was no break in the waves at all, but I chose a moment where the pressure was manageable to make a run and kill the ele boss. As soon as he (or the last boss) dies, the mission ends.
There definitely seems to be some luck involved. There were times that the npc groups would wipe very quickly, and then others where they would hold for quite a while. Also I've seen the paragon general himself rush the center bombard quite early in the fight. Not sure what triggers that. Maybe the bombard fell and I didn't notice. Whatever the case, this one was definitely a challenge.
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