I'm not really good with the technicalities and calculations, but here is what I know about armor shred and armor pierce.
Armor shred is when you tear up your opponents armor. It makes some part of it useless.
Armor pierce is when a percent of your damage bypasses the opponents armor.
If you have a lot of weapon items, I suggest getting armor pierce items, because armor pierce is based on percent, so the more weapon power you have, the bigger the damage for the percent.
If you don't...
Posted: Jan 20, 2016