Holy cow the Bat Baron almost killed my entire team

Pardon me for suddenly making another post here, but I just had to get this matter off my chest as I had to use 2 Life Bottles as while I am early on in Tales of Berseria, I didn't expect such a brutal wake up call as I almost wanted to reset the fight because this boss fight caught me off guard as I wasn't expecting him to be so deadly.

I mean, I am using the battle mechanics as I do switch between my teammates frequently as for starters, I have been trying to use a bunch of different Artes on my characters, but again I was not expecting to run into such a difficult boss battle as the thing almost killed everyone as now I am starting to see that Tales of Berseria is NOT messing around anymore with its fights.