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The playbook stands on its own - you don't need to have or want an Immolator in your game to use the Liquidator - but obviously it owes a lot to the class from which it's derived. The Liquidator is an inversion of a sort of the Immolator, by Adam Koebel and Sage LaTorra, for their game Dungeon World. It's water vs fire, or defense vs offense, or as many other classic dichotomies the juxtaposition implies.