The final encounter is broken. With the way nightfall scoring works, in order to break the 100k threshold you need a bunch of modifiers and a power handicap. With that said during his grab attack you cannot break free and he will consistently one shot your entire team, sending you back to orbit.
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I can tell you void singe, heavyweight, match game, extinguish and -175 power lvl got us slightly above 200k. From here, take out extinguish or lower the disadvantage, anything above 2.7 multiplier will do cause there are too many scorn minions xD