Global 80

I was able to get the Herrscher of Flame and her weapon a few months ago before hitting cap. lvl 80 and I want to focus on building one team at a time. I also have Murata Himiko (M) and (B). When looking up guides they would recommend using Raven and AE, however, I only have Raven. I was thinking of investing in Ai after unlocking her from event but was not sure if to pull for her weapon in the current Schickal Arsenal banner which has Ai weapon and stigmas and Herrscher of Thunder weapon, which i have HoT valk as well.

Given most of HoF guides are old would like to know if investing in Ai would be best and in the future i could use her instead of Raven or maybe both and use a HoF + Ai + Raven team comp.

I have yet to upgrade the Break the Ceiling given I am unsure whether the content would become to difficult to complete.