There's a progression ruining bug during the final stand of Raneik's Unified boss encounter in Vesper's Host. This didn't happen just once, but twice in a row on Normal difficulty. Basically, once the boss is down to a sliver of life, he will break apart into its individual Servitors (1 through 10). However, they're immune to damage and cannot be opened up to damage at all, thus resulting in no way to kill it. Me and my cohort tried using the Operator buff to put a code in, the panels were immune. Tried just waiting it out, no change. Tried shooting the boss with and without the operator buff, and they're immune. Even tried discarding the Operator buff, but nope. So until something changes, we're unable to beat Vesper's Host. We will try again tomorrow with a fresh instance. EDIT: Me and my Cohort confirmed the reasoning behind this bug. When the boss reforms after a damage phase it applies an immunity barrier. So if your DPS is just slow enough, it will apply that barrier while reaching the final stand phase and soft-lock the encounter. So, instead of trying to get it dead, slow down and leave a bit of life on the boss, let it take another rotation to clear. A Solid Three phase is better than a Bugged Two-phase.