
Fraust |

What are some of the goals of the magus?
To keep the sword and the magus working toward the same ends (roughly), you could have the sword being an old enemy of Xenisha(can't remember the spelling...), or the Scribler, or someone else similar. Especially big X, in that the sword could give the magus a few tips/tricks while fighting her to keep the party from suffering a TPK...sorta "I fought this wench before, and I know how good of a swordsman you are, you're not gonna be able to hit her until that dope in the pointy hat on your side dispells some of her defences!"

Son of the Veterinarian |

The blade is a creation of one of the Runelords and is feeding the energy from it's kills to help in the Runelord's resurrection, while at the same time working to prevent the resurrection of one of it's creator's competitors.
Sorshen would probably work best for this. She's not well sketched out yet and being the Runelord of Lust makes a connection to the CN Calistria almost inevitable.

Movin |
Depends on how involved and how much of a counter purpose you want the blade to have to the party, a companion, a fettered soul and a traitor angle wait below.
Hope the result of my thoughts helps you come up with something cool.
It could be