Health

First of all, Stash RPG does not provide a routine "restore over time" feature. Many new players get surprised on why waiting so long and having no Health restored. This is the fact: Health will never normally regenerate over time. Regenerating Health over time is only possible when inside the Rolling Stone Inn, or when using different kinds of camping bivouacs, either way this process uses up considerable amounts of time. Also, when using camps you are risking being ambushed by a group monsters. Therefore its is much more convenient to do "one click heals": instead, foods has to be eaten or potions drank, which makes procuring them the most important task in leveling a character. In combat, you cannot use food but only potions, they take up one turn to use and you are only allowed to drink one potion per so many turns, so keep it as a "panic button" for whenever you feel death is inevitable. Potions are not given separate cooldowns, so bringing several tiers of the same potion won't help at all, instead, bring the best one you got. Potions have huge joint cooldown in combat but not outside, where they can be spammed. Playing the Healer class greatly enhances restoration, although Healers have certain hold-ups when soloing due to weak aggressive DPS.

Health is increased permanently when you level up, or increases temporarily when you are buffed by an ability buff or a potion, or wear a gear piece with enchantments adding to Constitution, to an extent of 5 per character level for both ability/potion buffs and gear enchantments. It decreases only when you are hit or have a negative effect on you in combat. When your health falls to zero, you die.

As stated above, Constitution adds to your health.