Last part of The Taken War: Mars.
Need to be level 40, and about 250 Light
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Were we not supposed to solo the one for Taken War quest? I can understand needing a fireteam for the Touch of Malice quest version, but the lower-Light version? Just clear adds, destroy Blights, dodge obstacles, DPS the Echo. He'll take about two Sleeper headshots, or a few high-impact sniper headshots, before moving on to the next wave. Rinse, repeat.