Don't be ridiculous. An apocalypse would wipe out the Netherworld, in addition to the Human World and Celestia. It would completely upset the balance of everything, not to mention be the end of demonkind as a whole.

[He's very serious about that.]

And of course I'm a demon and a vampire. A proud and noble one at that! That is why I will not allow the destruction of the world for any reason!