You have a total of 5 days and 12 hours of free time before your next mission. Note that there are two things surrounding Carla in this free time. If you happened to give Carla all of the money she asked for previously, then you will get double that when talking to her in the Ready Room the first time. After that, talk to her again for an event, in which you’ll get the Sublimation Ring .

Bring your best ranged character for the next mission, except Trey as the boss is too fast for him to land shots cleanly. Cater with Elementillery or King work very well. Don’t equip the Magicite Pistol on Cater if you use her though as there’s an SO that requires you to not use magic and her Magicite is included in that.