That event is not possible right now. No matter how many people do this event those 3 workers just seem to vanish. And If you do happen to finish the event no credit is given.
From what I’ve heard and experienced, you need to get kill credit on at least one of the attackers for event credit and having more people just makes it harder because the mobs do more damage but most of your allies won’t be stopping them from applying it to npcs.
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