Known Issue with Passive Abilities

[Carapace]

how should we know the amout of attacking mobs modifier on what monster did you get this numbers. 1.04 and .00047619.
just want to know for future reference.

the .00047619 in this example is the amount of damage reduction per 1 point of armor. So with 980 armor, without the modifier damage reduction would be 980*.00047619 = 46.6%

this decimal number slides a bit every time the character levels so effectively you need more armor to stay at the same damage reduction, and thus can't just sit in your level 8 armor at level 20 and take any hits.