Roseblack is likely to try to take charge and coordinate an effort to take down Bankotsu, in the bossfight. Seems like a chance to actually use some of her general-ing skills and War Charms. Depends if she can get a few recruits though.
One tactic she'll probably be using is to put up a Dragon-Seared Battlefield to hinder Bankotsu with environmental hazards (grabby vines, fast-growing brambles, etc) while shielding her allies from its effects with Enfolded in the Dragon's Wings and buffing them with other War Charms.
(also why is the PM button greyed out on the Bankotsu journal?)
Re: [PLOT WITH BANKOTSU]
One tactic she'll probably be using is to put up a Dragon-Seared Battlefield to hinder Bankotsu with environmental hazards (grabby vines, fast-growing brambles, etc) while shielding her allies from its effects with Enfolded in the Dragon's Wings and buffing them with other War Charms.
(also why is the PM button greyed out on the Bankotsu journal?)