I just fought a GL Rey and timed out due to her not taking damage. Like she was absorbing all my damage and she wasn't using her ult or under the effects of damage immunity. The only thing I can see different is the new DC that grants Vanguard characters damage reduction on the start of their turn.
It makes absolutely no sense because why is Rey all of a sudden ignoring all damage after a certain point?
I can still hit her and do crits to clear her charges but she wouldn't break protection or take any health damage whatsoever in the span of 5 minutes with trying to do as much damage as I could to her. I used my Hyoda DC with JML team and I was running insane amounts of crit damage with no result.
Something is clearly broken and not working as intended because there is no mechanic on the entire team that has the capability of outright preventing damage as a passive effect.
To add a bit more info. I defeated Barriss as soon as I could and it had no affect on the outcome.