I beat the master event with a maxed out silver souls sister. It’s possible. The only BB I had was head over heals BB3 so I was reasonably assured I wouldn’t proc the fatigue. Then I just spammed orbs and made good use of lash out. A little RNG also helps with the team you end up facing.
I was chatting in the SGM app and someone named Colt inspired an awesome idea that I thought had to be shared. Perhaps in the future, combined dailies would be possible as their own event?
For example: Filia's daily - Bleed procs
+ Squigly's Daily - Doom at 50% enemy health...