^From my understanding, She's not actually cursed anymore as a servant, but she still has lingering issues with it in the form of PTSD and fearing she'll lose control again, she feels like she's cursed and still under the effect even though she's not. Which is why the Summer event scene is such a big deal for her, where she starts to overcome some of that lingering feeling of being cursed, and now she can do more without living in fear of losing control, including that she can now use her real name. So I don't think the sword is as needed as she thinks it is. Melusine doesn't need it either to my knowledge and in the Summer event she says she only uses the Round Table name gifted to her because she thinks it's cool, not because she needs it. I think Sith is also fine now. The Summer event serving as a prologue gives them a pretty happy ending as servants. Maybe I'm misunderstanding something, but this is my take away anyhow.