Stuck at 97% and have been thinking/trying about other "Activities" that can accomplish this to no avail. The challenge just says "Activities" but seem to only progress via the single rare Public Event.
After the new season, has anyone had any success at progressing this via a different way?
Patrols, adventures, lost sector, strikes, and even the new activity (that is on Mercury?) all do not seem to progress this.
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Here is what I found as this current week is Mercury(S10 Wk2). Brother Vance Bounties = 0% Mercury Patrols = 0% Regular and Elite Mercury Defenders and Conquerors = 0% Elite Defenders and Conquerors are High-Value Targets. Regular Adventures = 0% Storm Minotaurs from Vex Rings = 0% Cabal Prisoners = 5% Must kill all 3 Psions and the Centurion. Terminus Keeper Hydra = 5% Spawns from unlocking the lost treasure chest and you only have about 2-3 minutes to kill it. Lost Sector = 10% Current Heroic Adventure = 20% Regular and Heroic Public Event = 20% Both versions give the same percentage but Heroic should definitely give 10% more because of its low spawn rate. The quickest way in my opinion is to run the lost sector until the PE spawns then just burn through it and repeat until the Flashpoint is done.