system
Given the following post, respond as if you're commenting on Reddit:
human
[General Fantasy] ELIBarbarian: What is "hit points", how does it help me slay my enemies

Our clan, the mighty Bear's Maw, long glory to its name, recently raided and pillaged the rival Wolf-gaze stronghold, whose name is now dust.  In the clutched hand of a slain warrior, I found an amulet, which I claimed as my battle-prize.

Our shaman is wise in the ways of magic, but also speaks strange words.  He speaks that the stone's magic will "increase my hit points".  Perhaps sensing my confusion, he further explained that it would "increase the damage I would be able to endure until my death in glorious battle".

I know of battle damage; my steel is sharp, my axe-shaft strong.  With a clean strike, I can often fell my enemies in one blow, spilling their entrails or severing a limb, spilling's life's-blood.  How exactly does this amulet's magic allow me to take on more damage?  Will my skin be as steel?  (It does not feel any stronger.)  Will it curse me to live with open wounds or sores?  Will it create new limbs or eyes if I am to lose them in battle?  The more I try to understand this madness, the more I curse all wizards and their coward-spells.  To the hells with this amulet!
gpt
Think of Hit Points as your life-force; it is a measure of the overall state of your body, as well as its resilience to pain and injury as a whole. 

Someone with low hit points is likely physically weak. A solid punch, a hard fall, a glancing blow, or a even just a hostile environment can all lead to a quick death for someone with low Hit Points. It is a measure of "how much punishment you can take".

Because you are a great warrior, you have a lot of hit points. This means that the attacks of lesser men often have little overall effect on you. They punch you, and you get angry. You punch them, and they explode into a red mist. An arrow in your shoulder, a gash on your leg, or a hit to the head don't stop your whirlwind of carnage, and only when injuries begin to pile up does your stamina falter.

When your shaman says that you can be endowed with more Hit Points, he is simply stating that you are going to become even more resilient in battle. You are going to become an even more potent warrior, not because you can hit harder, but because you can take more hits. 

May the Bear Maw Clan prosper.