But which ones
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In the customize section of an activity (example Strike) you can select a faction modifier such as Hive Firepit, or Vandals drop their exploding mine (whatever it’s called). These may or may not be in rotation weekly. Note: This must be done on expert difficulty.
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What are you refering to more exactly? If you refer to the activity modifiers you and find/equip them in the first row for the second to the last slot just hover over the modifiers and under their name you will see that it is specifice what kind of modifier it is