I thought of an idea for an alternate hp system today and I'm wondering if any of the more table-top savvy members know if this already exists somewhere or if I actually did stumble into something new.
Basically, it revolves around pain and tolerance. Each character would have pain tolerance, which depending on the setting would be split into multiple categories (mental pain tolerance for cthulu sanity, that sort of thing). When a character would suffer damage in any other game, in this system they'd receive a small amount of pain, which would count against their tolerance, and roll a d20 save to determine whether they can withstand their current pain level.
For example, let's say this is a fantasy game and you're playing a fairly squishy low level Wizard with a physical pain tolerance base of a mere 8. A goblin shanks you and you take one point of physical pain, which reduces your effective tolerance to 7. A d20 is then rolled, and if the roll is higher than your current tolerance, the pain overwhelms you and you fall unconscious. If you roll lower than your tolerance, the pain was not enough to overtake you and you continue fighting until more pain forces you to make another (more difficult) roll.
If you're playing a bulky high end fighter, however, you'd have a fairly different experience. A character used to taking a beating might have a large pain tolerance, like 25, so that minor scrapes from goblin daggers would literally never be enough to overwhelm them. The fighter would have to take six points of pain before it would potentially be enough to knock him down, and then only if a 20 is rolled.
A character knocked down that is dying out must roll each round, as if they'd taken more damage of the type which felled them. A knocked down character that fails one pain save becomes fatigued, which means that even if something causes them to recover they're going to be worn out and functionally useless for a while. A character which fails and was fatigued is now dead.
Healing a character removes pain. If a character is healed while knocked down, they get to make a pain save to attempt to recover. A success means they regain consciousness while a failure means the healing wasn't enough to rouse them, but the pain was still removed and so making future saves will be easier. A character healed to full tolerance wakes automatically. A character reduced to 0 tolerance dies immediately.
Does this interest anyone? Do you know of a system which already does similar things?