Cain and Dean in “Unfinished Business”

Cain

I can give you the mark, Dean, if it's what you truly want.

Dean

What are you talking about?

Cain

The mark can be transferred to someone who's worthy.

Dean

You mean a killer like you?

Cain

Yes.

Dean

Can I use it to kill that bitch?

Cain

Yes. But you have to know with the mark comes a great burden. Some would call it a great cost.