In "Sine Requie: Snake Eyes" you'll have to pay close attention to the Mental Sanity of your characters given how stress, shocking experiences and the horror of the Dead will put their resolve to the test.

When Mental Sanity drops to zero, the character will be considered exhausted when it comes to combat and recovery, and they will risk gaining a negative trait which will hinder them from that point on, imposing a penalty on certain tests and adding new dialogue options. 
The more frequently Mental Sanity drops to zero, the more likely it will be for the character to suffer those negative traits, so keep an eye on that and make sure to bring some Luxuries with you in order to regain Sanity!

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