Okay so, prepared Arika is in her strongest form I guess, and knows what she has to do to beat Xellos, which is basically eradicate his entire form. Can she do it? She has the power to, and I would say she's not the typical opponent he's used to facing, not that he fights much anyway but he's clearly shown that he can. I'm having a hard time in my mind though, seeing her taking him out when she seems to have so much trouble according to my understanding, in terms of fighting new people and using her powers to their fullest. And she also seems to need to consult with others alot. She just doesn't seem like a person who would excel immediately at this sort of challenge. So, while I think it's a good fight, I think Xellos will probably kill her before she can do him in.