Dungeon Mastery: Taking a break from your Sanity

You have seen and experienced things that have slowly pushed you to the brink. Villagers slaughtered when goblins massacred your village. Children impaled on poles. And the response of the latest madman to sit on the throne has been scorn. Its has slowly gotten under yor skin. Lately you have felt a need to crawl into the deepest hole of a dungeon to escape the horrors of the surface. Down here in the crawling and slithering darkness things make sense. 

Reality takes a toll on the mind. Charisma isnt just your leadership and pursuasiveness, its a measure of your mental fitness. This is why the Player Characters need a Sanity check.

Players need to roll against their character's charisma to see if their character's well being starts to decline. And charisma shouldnt be fixed. Every failed check should be physically and emotionally taxing. Charisma should lower every time the Player Character struggles with experiencing something terrible. After all, you would have to be some kind of monstrous animal if even killing goblins didnt bother you.

Keep a count of the number of kills in an adventure by PCs, and undertake a Charisma check. Lower their charisma by one point if they fail. At some point Alignment breaks... Lawful becomes Neutral. Neutral becomes Chaotic.