Great guide!
Though the fusion rifle bounty is easily done with the defending the warmind mission in TDB. The thralls run at you in a straight line. Murmur them to death quickly and easily. Bounty done in a few minutes!
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There is the moon mission where the ghost says, "We've woken the hive!" That has a ton of thralls running at you too. Don't kill the knight, and when you've cleared most everything, let the knight kill you, and you start again from where the thralls attack you. Wash and repeat until you get the fusion rifle bounty done.