I have been unable to complete a single one. In the challenge where it lists number of combatants eliminated I have completed all of those. But still can't figure out what I need to do to finish the "More than a Weapon" part. Any suggestions or urls that explains in detail?
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More than a Weapon is the seasonal quest line. Every week you need to complete a few steps, typically, do a Heist Battle Ground, talk to the Exo frame, visit the holo projector. Rinse and repeat every week. Look in your quests/missions tab, not your seasonal challenges tab. Typically the first step is open a seraph chest.