User blog comment:Linathan/Squad Spotlight & Guide: Karna Masta (Mildran)/@comment-26149388-20160708055852/@comment-26140304-20160709214946

All buffs get removed except Barrier when Millennium occurs. While you can live it thanks to barrier, I still suggest guarding all units since BB/SBB bursting with everyone would be useless due to buff removal and you'd have to refresh all buffs once again.

Second phase below 50% is an utter pain since you have to pray lots to RNG for Karna Masta to not focus-target your units. I wouldn't recommend using any items for the first phase of the quest since he doesn't seem too threatening if you know the pattern well. You'll need all of the items for second phase in case RNG messes you up immensely.