Mouseferatu
Hero
Silveras said:THAT, however, points to a need for the DM and Players to know each other, how each other is likely to react, and to have a working degree of trust that such changes are not "just to screw us over". NO rulebook can make the Player Characters safe when that trust is not there.
Worth quoting, and expanding on.
One of the bits of advice we offer on running a horror-based campaign is that it requires trust and cooperation between players and DM to make it work. To put it bluntly, you've really got to be friends for this. If players aren't willing to put a substantial amount of trust in the DM, or if the DM just wants to "stick it to" the PCs, horror may not be the best genre for you, at least not in the long-term.