HP, also known as health or health points is used to denote the life level for all creatures. When their health goes to zero, they are dead.
Characters have an innate replenishment rate for both health and mana. The rate at which these two stats replenish is based on the various attributes. There are also some skills that can raise the replenishment rate for these stats independently. Health can be replenished both instantly and over time during combat using healing potions. Health regeneration can be increased somewhat by sitting down on Woodie Stools.
The maximum amount of health is determined by a combination of the creature's class, level, Strength, and Vitality. In addition, some items have +health stats. Finally, items can be enchanted to give additional increases to health.