What determines if you lose HP?

[Leeroy]

Sometimes when I get hit it only reduces my Toughness, other times I lose toughness and a little bit of HP.

[Nihil]

If you loose your Thoughness, the next hit you take will be taken from your HP.

Direct HP damage should only be applied as corruption "damage" (purple HP) if you still have thoughness

[アゼム]

The % of toughness you have is the % of mitigation you have from melee hits. So you have 100% toughness? That's 100% mitigation and you take no damage. 90% toughness? 90% mitigation with 10% damage.

[EmDriver]

I'm not sure if any enemies in the game actually take advantage of this but the damage you take while you have a shield also counts as bleed damage.

[-samurai-]

Originally posted by TaquitoBurrito:

The % of toughness you have is the % of mitigation you have from melee hits. So you have 100% toughness? That's 100% mitigation and you take no damage. 90% toughness? 90% mitigation with 10% damage.

Well by this logic its better to have less toughness and have a constant way of regening it?

[Claymore Roomba]

Getting hit in the back with melee penetrates some toughness. And some enemies do too with all of their attacks, like maulers and ragers with the slowest of their moves.

[ionkiller]

Originally posted by -samurai-:

Well by this logic its better to have less toughness and have a constant way of regening it?

Why are you trying to apply logic that isn't logical?

100 Toughness vs 150 Toughness
Say you get hit by a -50 attack.

You end up with
50 vs 100

This is the difference of
50% Damage Reduction (1/2)
vs
66% Damage Reduction (2/3)
On the next attack

Now what Toughness Gen is gonna offset an already better 16% increase in damage reduction?

Oh wait there isn't. Take Ogryn's Single/Multi-Target regen options which give 20 Toughness (Or 20%, which if that's the case is amped up even more with toughness curios investment) (Also yes I'm still basing this on the 100 +50 model)

70/100 (30% Dmg Bleed Through) (70% Reduction)
120/150 (20% Dmg Bleed Through) (80% Reduction)

Edit: TLDR this isn't Warframe, you're not shieldgating anything.

[Mori]

I'm surprised nobody has answered the OP question.

It depends on what is doing damage to you. There are an egregious amount of sources of direct HP damage atm. Some of those off the top of my head being:

Barrels
Pox hounds
Mutants
Ragers
Maulers
Snipers
Crushers

Enemies that use fire (Tox flamers and scab bombers) will instantly deplete 100% toughness on hit, so you could also see that as a surefire way to take immediate health damage.

Picking up grimoires / being in a squad with grims will also fill your health bar up with purple, effectively eating away at your HP. Grims will take up about 1/5 of your health bar with purple, and they will continue to eat away at your health bar until you've got like 2hp left and can die immediately to any health damage sources. (Which make up a good chunk of damage sources in the game at the moment.)

[ionkiller]

Originally posted by Ava:

I'm surprised nobody has answered the OP question.

What do you call this?

Originally posted by TaquitoBurrito:

The % of toughness you have is the % of mitigation you have from melee hits. So you have 100% toughness? That's 100% mitigation and you take no damage. 90% toughness? 90% mitigation with 10% damage.

Originally posted by Ava:

It depends on what is doing damage to you. There are an egregious amount of sources of direct HP damage atm. Some of those off the top of my head being:

Barrels
Pox hounds
Mutants
Ragers
Maulers
Snipers
Crushers

Enemies that use fire (Tox flamers and scab bombers) will instantly deplete 100% toughness on hit, so you could also see that as a surefire way to take immediate health damage.

Also on this. What?

Snipers?

Ranged can't do direct DMG to HP until your Toughness is (completely) broken. Which in the case of Snipers, they have increased damage to Toughness, which in most cases (deletes your Toughness) and bleeds through the left-over damage.

I'd assume for the other cases. It's the situation of there still being bleed-through even though you were at max Toughness.

As in:
100 Toughness, you get hit by a Crusher that deals 50 dmg (very unlikely probably). In simple logic, that means their attack should be completely negated. But if it works how I think it works. It *is* negating the damage, but it's being negated over the Toughness damage done.

So a part of the damage is negated by the 100% Toughness, another part might be negated by 90% or 80%, then the final part of it could be I don't know, like 50-60%? It's probably more gradual than that, ranging between 100%-50%

That'd make sense to me on why there is bleed through on big-damaging attacks like Barrels, Mutants (since they're bashing you multiple times), and so on.

And in terms of negating trash, that'd be miniscule pieces of 1-2 HP dmg or whatever.

EDIT: (Then again I could be wrong on this as I have screenshots where Fatshark has said Damage Reduction is based on damage done at the time at the strike, but still, the cases we are taking more damage than we should, is likely attributed to having lost all/most of our Toughness in one strike, (which in another logic could mean *big* strikes bleed through)