Originally Posted by stampede
Just throwing this out there but if you have 5 sunders checked and change your armor pen from 100% to 80% and regem for Strength it doesn't change your dps on the spreadsheet.
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It's been established for some time that Sunder Armor and armor penetration do not stack additively. That is, rather than contributing 20% armor penetration to all physical attackers of the sundered target, Sunder Armor
reduces the baseline armor that ArP
ignores. For example, say you have a target with 10,000 armor who has 5 stacks of sunder and is being attacked by a character with 80% armor penetration.
The 5 stacks of sunder take the target's armor down to 8,000. Since the attacker has 80% armor penetration, the target's
effective armor versus that attacker is 20% of that 8,000. That means that, if you leave your ArP at 80%, the target still retains 16% of its original effective armor against you - even with 5 stacks of Sunder Armor.