Demolition's ignore defense post BB

I tryed to post this in the KOR adventurer tables but the 21 day rule didn't let me, and I'm lazy to type it all again so I'll just type it short.

Description for max lvl demo on google translate says:
- MP 50 consumption, 8 times, attacked with 410% damage, ignores 20% of the target's physical ERA -

How does that 20% ignore work?
Is it -20% of PDR like:
Monster has 25% pdr, with demolition it has 5%

Or is it -20% regular defense --> Monster had 100 def, 80 affect you when using demolition.

Or maybe it's 20% chance to ignore all defense?
... Can anyone explain please?

I want to know that too.

Is there a third possibility? Like, the percentage being a probability rather than the defence reduction...

I think it's 20% chance to ignore monster PDRate.

Talk to 505 about this. He's done the most research. He stated that it's a % off of the enemy PDRate. So 25% would mean 2.5 (rounded) off of a 10% PDRate, so 3%.

I personally just think it's 20% chance to ignore physical defence.
But I never really cared enough to "test" it.
It could possibly be 20% chance to ignore pdrate entirely, which is entirely possible because I randomly do 50ks in demo against pap in a sea of 20ks, but my damage is WAY too unstable to figure out for sure.

(If I recall correctly) I asked a korean in our guild to translate it, and one of the words was ignore. So I don't think it's - or %down.

Talk to 505 about this. He's done the most research. He stated that it's a % off of the enemy PDRate. So 25% would mean 2.5 (rounded) off of a 10% PDRate, so 3%.

so from zakum, which has (I think) 25% PDRate, it would make it 20%? (Max lvl is 20% reduction)