[QUOTE=Ryllharu]If she's not trying to pawn off a fake to ingratiate herself, maybe Medusa wants BREW to be in Shibusen, right next to all of the other Eibon Tools./QUOTE]

I was thinking something along the lines of that too. For some reason, she's always wanted to know of the location of the other Eibon Tools. BREW may be to the most powerful tool around, but quite possibly it's in conjunction with the other tools where it's true power is revealed.

Lately, Shinigami's been portrayed as a bit of a shady character, or just one who's not a simple black and white character (no pun intended). He'll definitely hear Medusa out if she's can get him something he wants.