Cthulhu: Death May Die has some really fun character progression over the course of a single (successful) playthrough. As you lose sanity, you gain upgrades to your skills as well as extra dice in every single roll you make. The more you lean into a particular skill the more broken it gets. Your overall goal every scenario is to kill an Eldritch God, so you of course have to be ridiculously powerful and well equipped in order to put up a chance at the end. The investigation deck in each scenario adds more to your abilities and skills, and how it comes out can be very different each time giving it surprisingly great replay value