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The Creeper knows all, foolish mortal!... Ha Ha Ha... except what you're talking about, Batman.
Maybe once I would've been glad to be rid of the Creeper, but not anymore! I realize now, he and I are two sides of the same coin -- like it or not, he's half of what I am. You want him, you'll have to go through me first!
Well, he lied to you, stabbed you with a syringe full of crazy nano-cells, created two monsters and almost killed us on a beach with one of them. Do we really need to know more to understand Yatz is off his nut?