Just did the new weekly boss using Fischl, Ganyu, Xiangling and Noelle. Easy mode. Noelle is c6 with a build for 100% sweeping time and its just so easy and quick. Was worried since the first time I fought her, it was a bit of a challenge and went so slowly. Even with a healer. My Noelle also makes the thunder manifestation a joke as well. When in doubt, just use 100% sweeping time and its easy mode lol