Highlighted weapons are free options.
This Build focuses on Rosaria's Buffing/Energy generation/Cryo application capabilities. Though it does not mean that you dont invest in her personal damage, only that it's a lower priority overall.
Rosaria A4 passive provides a potent CRIT Rate buff to her teammates via her own CRIT Rate after casting Burst. This heavily incentivizes building enough Energy Recharge to Burst consistently and getting as close to 100% CRIT Rate as possible