When i think of acid damage, i think of Aliens - it's not something that just goes away on a failed save, it's sticking on you. It's just like being set on fire - just because you fail the save doesn't mean the fire goes out. Armor and lots of gear has more than 1 save before being destroyed, and until the acid neutralizes, it should be able to eat at the stuff.
Re-reading a couple times, I am now confused by how Acid Damage works on armor in general.
In particular, the second block: "Acid is particularly destructive against armor, which makes a Damage save once per round until the acid damage reaches 0. If even a single Damage save fails, the acid’s remaining damage is applied against both the armor and the character within in each round."
In a standard attack, if a character is hit, the character takes damage, not his gear. I could not find anything anywhere that indicated a character could have his armor hit with acid without the character also
being hit by acid. It DOES say just before Acid Damage that "some damage types, such as acid, also damage a character’s gear or surroundings." If I am taking Acid Damage from an attack and the GM decides that the damage also applies to my armor and it fails its save, am I now taking twice the damage I would have had I been standing there naked (once from the base attack and once again from the failed armor save)?
I had originally understood, seemingly incorrectly, the Acid Damage block to mean that your armor makes a save when you are first hit by acid and if it saved it was fine, but if it failed it had to continue saving each round for the acid damage. But that doesn't seem to be the case.
How then would acid damage be applied to just the armor? Would I need to make a called shot? if I don't use a called shot, is the armor free from needing to take Acid Damage from the attack? Or should I just make sure to use my acid attacks against the lightest armored guys on the field in hopes their armor will fail the save and I can do double Acid Damage to them?
My understanding of how acid damage works:
Let's say we have a character -- Kevin -- wearing partial studded leather (DR 2, Soft 2). He cops 12 pts of acid damage.
1st round he suffers 12 pts of damage, which his armour reduces by 2 to 10.
2nd round he suffers 6 pts of damage, which his armour reduces by 2 to 4.
3rd round he suffers 3 pts of damage, which his armour reduces by 2 to 1.
4th round he suffers 1 pt of damage, which his armour reducees by 2 to 0.
However, that 12 pts of damage requires his armour to make a save. Being Hard 2, that means he gets 2 saves (DC 10 + 1/2 damage) before it's broken
(and thus stops working) and 4 before it's destroyed
. Being Hard, each save is made with a +5 bonus. Being gear, each save usually ignores all preceeding damage.
This assumes he passes all saves.
1st round, his armour suffers 12 pts of damage --> DC 16.
2nd round, his armour suffers 6 pts of damage --> DC 13.
3rd round, his armour suffers 3 pts of damage --> DC 11.
4th round, his armour suffers 1 pt of damage --> DC 10.
Assuming he fails the final save:
5th round, his armour has only 1 save left until it becomes broken
but suffers no damage.
Assuming he fails the 3rd save:
4th round, his armour has only 1 save left until it becomes broken
& suffers 1 pt of damage on top of the standard save DC formula --> DC 11
Assuming he fails the 2nd save:
3rd round , his armour has only 1 save left until it becomes broken
& suffers 3 pt of damage on top of the standard save DC formula --> DC 14
Assuming he fails the 1st save:
2nd round , his armour has only 1 save left until it becomes broken
& suffers 6 pt of damage on top of the standard save DC formula --> DC 19
(yes I know it's ordered backwards but it makes it easier to see where the 1st point of failure cuts in, as the first failed save affects the DC of all subsequent saves).
Going back to the damage Kevin suffers and factoring in worst case armour failure:
1st round, armour fails 1st save, Keven suffers 12 - 2 = 10 damage.
2nd round, armour fails 2nd save & becomes broken
no longer granting any DR, Kevin suffers 6 damage.
3rd round, armour fails 3rd save, Kevin suffers 3 damage.
4th round, armour fails 4th save & becomes destroyed
, Kevin suffers 1 damage.