Of the Sebille skills listed above, I only have backlash and I don’t have bouncing shield or whirlwind on red prince (though my power infusion incarnate does have whirlwind)
Another point is whether it’s worth even talking to start the fight, as I can summon an incarnate, run it up, wait till the cool down ends and right click attack radeka for 25 dmg to start the fight too.
Yeah if you don't have a shield that's ok , it's not absolutely necessary. You can get other stuff like crippling blow and battle stomp and stick to a 2H if you want. And definitely have fortify, magic armor, and a couple peace of minds. Your Ranger probably has the huntsman heal already, which is a great one. I'm sure you already know, but it's pretty helpful to before starting a fight to have Encourage+Rest(set your bedroll to 1 to do it fast), and maybe a couple other buffs already on your people.
Multiattack comes automatically from dual wielding dagger, no skillbook necessary.
For Skillbooks:
Hilde(next to Griff) has Scoundrel books for Sebille (another skill she should have too is Adrenaline)
Kalis the Lizard soldier in the elf cave has warfare skillbooks.
http://divinityoriginalsin2.wiki.fextralife.com/Fort+Joy+Ghetto <--- This has all the vendors listed in fort joy
And yeah I suppose you don't even need to talk to her. I would start with your highest damage off the bat on a beetle honestly. Since you probably want a fire incarnate you can't attack her because she's immune, and actually it's probably best to wait to summon the incarnate until after the fight starts, since it gets a turn immediately.
