blue cojet is for anti healing, but if you get a better dps you can too,
henry+ is for atk+ ulti buff and heal, karin for errors, kade for -atk -def debuffs.
Boss overall strat is keep aiming for the support succubus then offensive then boss, suggest to increase divinity attack to lvl 6 for smooth runs, blue cojet is wearing full crit set/ henry+ atk set/ karin cd set / kade 2 def 3 block