Got to the final boss and got his shield down for the first damage phase but there was no way to get the shield down for the second phase?
The invoking hive magic didn't appear for the second phase so I'm not sure if there is something else we're supposed to do to get his shield down?
After trying for 15 minutes to figure it out I just left the activity.
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I have also had this problem three times so far. All on gm difficulty. I was able to complete the boss phase on ultimate once, but another problem I experienced on ultimate was not progressing from tier III to the boss phase and the timer going down to 0 and nothing happening.