Hey, 1HP is 1HP, and your attacks will still hit just as hard as if you were full HP.

Are you sure? I mean isn't there no system out there that makes you weaker when you're low on HP? Or is it just working this way with things like fatigue?

Exalted has always done exactly that. You start to take "wound penalties" the more damage you have.

Shadowrun does that as well.

Even without one, clearly that amount of damage has knocked them prone for the round.

D&D doesn’t work that way on purpose. If low health gives you any additional downsides at all, you get death spirals, where a slight tilt in one party’s favor at the start of an otherwise balanced combat will build on itself until it becomes insurmountable.

That’s not necessarily a bad thing, but it gives combat a specific tone that isn’t what D&D is going for. It’s the same reason injuries are never more than an optional rule mentioned in a sidebar.

It's a consequence of the simplifying that D&D has been going for. There's less things to keep track of overall, making it easier to jump into and all that.

It's been a part of the game from the start, so I think "How it's been simplifying" is a little inaccurate.

I think it has its roots in D&D's origins as a wargame- 'individuals' were singular points of larger squads, and so had a binary of 'alive' or 'dead'. So the unit as a whole (the Party) would suffer from having more or fewer of its members indisposed, but the individuals didn't have those penalties.

Gurps has a couple different mechanics dedicated to this. Firstly, the immediate round after you get injured, you get a shock penalty towards your attacks and defenses based on how much damage you took, which can really lead to things snowballing badly. There's also fatigue penalties where if you drop below a certain level you start taking some pretty severe penalties. And if specific body parts take enough damage they'll get crippled and cause all sorts of problems. Still, in theory you could be at like, 4 times your hp below 0 and still going strong as long as you keep making the checks tot stay conscious lol.

*goes to mention GURPS

...huh? Someone beat me to it?

I don't know how to feel about this...

;)

there's Traveller, which has your strength, dexterity, and endurance as your combined health pool. when you take damage, endurance goes first, then more damage beyond what your endurance can handle goes to strength and dexterity. which is fine if you're a very physical character, but if you've got middling or low physical stats you're going to crumple like tissue paper

Cypher does that with all three stats(might, speed and mind), which are pools for enhancing your checks.
Each pool has a specific effect when depleted.
0 might exhausts you, 0 speed cripples you, 0 mind ends you.
System is optimized for exploration, not combat.

Stamina and hp are different

Can you end with HP in decimals? With how low are Ussop physical stats, I could imagine him end with 0.01 HP

Nope, explicitly only whole numbers, fractions are generally rounded down.

Oh darn. I have finally caught up again.