How do you set a tone in a game?
Call of Cthulhu has a sanity system. It was one of the first games I encountered where there was an attempt to address genre conventions. The question of how successful this system is...that's been very debatable over the years. The more infamous incarnation of the game "Dread" uses a Jenga tower. "Dogs in the Vineyard" uses a core mechanism that is all about escalation, leading to higher drama and more intensity. But generally I've found that most system mechanisms really don't reflect genre conventions, they typically don't add flavour even though I can sometimes see how a designer has attempted to enhance flavour through such mechanisms. I don't claim to know every game system, nor even half of the games that are out there, some games might have mechanisms that really inform genre conventions well, but I just haven't seen them. Instead, I find that most genre and flavour elements are introduced by players and the GM, often outside...