questions: armor-breaking and anti-items?

[VladK02]

Im building Mordred into a tank.

Im not clear how armor-breaking stacks and works with items that reduce incoming armor-breaking.

Question 1: Do items that give Ignore -25% of incoming attacks armor-breaking, stack?

I have 1 ring of -25% and 1 oathstone of -25% on Mordred.

So I should theoretically have -50%?

Second question, how does that work with damage?

Lets say Mordred has 12 armor, and -50% armor-break mitigation.

He gets hit by, lets say, attack value 20, armor-break chance 20%.

So, 8 damage goes through. OK. Of that 8 damage, 20% is 1.6 - so I should lose 2 armor tokens. But then I have mitigation, how is that applied? Is mitigation reducing this 1.6 by 50% to 0.8?

Or does mitigation substract from 20% armor break chance of the attack? Attack does 20% break, I ignore 50%, 20-50= -30, attack is now at -30%, mitigated entirely, I lose no armor?

Edit - a small test answers my question. Items are worthless.

A no-name zombie hit my 14 armor mordred for 4-6 damage, with -10% to armor break....and broke 1 armor token. meaning, unless you have -100% to armor break somehow, it will always round out to you losing at least 1 armor.

[Dslim]

The best stat you can have is unbreakable armor. Late game i have like 19 so far and am almost unkillable.

[Direbear]

%armor breaking multiplies on initial damage. So if Zombie hits for 10 damage with 10% armor breaking it will always take off 1 armor if you have not -%armor breaking.