So point me in the right direction here, but I can't seem to find anything on it, but this past wkend I ran a tier 3 blind well with some randoms. We pull it off, start to head to the chest then all of a sudden a whole different encounter kicked off with two bosses on either side, I didn't think anything of it, just that maybe it was the actual ending fight, so I didn't actually pay too much attention to who they were. However, it appeared none of us could damage them, at least they were all immune on my end. It was basically the same concept of the previous bosses... shoot the guy's with the yellow aura, then damage bosses.
Has anyone else seen this encounter? Reason I'm asking is cause I figured I'd look up some points as to possibly why we couldn't damage them, under light/power level? whatever, but I've found no one showing the encounter I experienced.