User blog comment:Kaido King of the Beasts/Destroy the World!/@comment-24638955-20140909141810

I think is really simple, Doffy wants the "World" meant as Planet destroyed.

How? He has resources (weapons,drugs etc.), charisma, information and is smart.

He just has to give some reliable information with some lies in and make a country or a faction start a war and make it expand to the most places as posible. He also can send some uncover family to make it happen or by favors in the underworld.

About Kaido if you remember it was unilateral, implied indirectly from Doffy, it was kind of "Make Df or I destroy you" Doffy doesn't get any benefits from this deal.