Game content notice
Sometimes things are just… psychically wrong. There might be things make you wince and feel a touch squeamish. In short, some content may be disturbing to some players. Some things should be disturbing to players to create atmosphere and connection with the game world.
When I mention "disturbing content" it is meant in a Lovecraftian sense, but it could also be in a "Saw" or face-of-evil, gratuitous gore or violence sense, too. In general, graphic sex and sexual violence are completely off the table (I'm not really talking about boobies; who doesn't like boobies?), but other societal taboos are not:
- body horror
- slavery and slave trade
- human sacrifice
- murder
- violence against the weak, including children and animals
These are common themes in the source materials that fantasy games draw on, and it's not unheard of that enemies and villains1) may partake in them. I can't see elaborating on any of that in graphic detail or in a way that triggers someone, but if the very idea of it existing or merely mentioning it during play is hard for you then we might occasionally cross a line for you. 
I guess what I'm trying to say is that my games can potentially be rated M for mature for violence, disturbing scenes and language, but it's not guaranteed.
(On the plus(?) side, if I am making the game more squeamish, it means I'm more comfortable with the folks around the table.)