I never thought I'd be posting something like this but my clanmates and I are becoming very upset with a certain forge: Gofannon. I went in with a clanmate and attempted to complete the forge activity but EVERY TIME on the third wave, one servitor floats over under the boss servitor and they start making EACH OTHER immune. Getting constantly teleported around with no way to deal damage to either servitor is starting to get pretty infuriating. I like doing the forge activity, but not if the new update suddenly makes it impossible.
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DPS the boss until the small servitors spawn, then make a priority to kill them asap. They will eventually try to shield the boss and themselves but they are not immune to supers so just make sure someone in your team has one ready when this happens. This is what I do as a hammer titan even when playing with randoms and I've saved a bunch of runs with this strat. If we manage to bring the boss down to about 1/3, then I focus the super on the boss to finish it off.