Health

The Health Bar is the Character's HP allotment in Darkest Dungeon. When a character runs out of HP, they will enter the Death's Door State.

The HP Base can be increased with Armor.

Every time a hero enters Death's Door the Stress Bar's of all your party members will increase, every time this hero takes damage from now on has a chance of permanently killing off the character. This is called Death Blow.

The state can be cancelled out by healing a character.

Various class skills can heal HP during combat, but only Food is able to heal adventurers outside of combat.

There are Trinkets which increase or decrease the Death Blow chance.