[quote=@Lugubrious]
<Snipped quote by NarayanK>

How much overall would this increase her dangerousness / combat ability?
[/quote]

She would have more mobility options and use more strength in general, I think. She would also have another arm to support her swordsmanship so she becomes a lot stronger! It'll be less of a hassle to detach from herself on the long run, so overall it's a pretty significant boost to her strengths. It's like a whole new body part for her, I guess xD