This mod add an adition ar bar called for sanity. Sanity will always be full if you're careful. BUT if you mess up things won't go as planed.
Recommended to use jei(Just Enough Items) mod to get sanity healing foods but you can also get it from default minecraft recipe bar.
This mod is designed to make you suffer(in game) not lose you prograssion only to scare and make the game more difficult.
If you go to caves be sure to bring torches with you.
