The most important combat feature in Sekiro is its health and posture system. Each enemy and your character has a health bar and a posture bar. If your hp or your enemies hits 0, you will die or they will die. However, if you or your enemies posture bar fills up completely, your character will be knocked off balance while enemies will be open to deathblows. These unique attacks instantly kill normal enemies and take a health bar off of bosses.