[Gifts of the Lotus Defense - Defense target instant death.]

Me and 2 of my friends were also having this issue, after a while we figured out that it was actually manics doing one of their teleport and insta kill attacks on him that was doing it. so we adjusted and used a gara wall to keep him trapped in one location, and a largish limbo cataclysm to keep everything at bay and stasised, and oberon for healing and also some hallowed ground to kill stuff. We also figured out that the manics have an invincibility phase, so you actually cant killed them while theyre stasised or in the bubble. So you let them stay frozen, kill everything else. then kill them last, there seemed to be at least one manic for every wave. Side note, to kill the manics you do actually have to drop the cataclysm, or drop stasis and lure the manics outside of the Cata. Hopefully this helps some of you guys.