When the Devil needs a rogue demon killed, who does he call?

The Player: Necromance-for-hire Dante Valentine is choosy about her jobs. Hot tempered and with nerves of steel, she can raise the dead like nobody's business. But one rainy Monday morning, everything goes straight to hell.

The Score: The Devil hires Dante to eliminate a rogue demon: Vardimal Santino. In return, he will let her live. It's an offer she can't refuse.

The Catch: How do you kill something that can't die?