League of Legends Mastery: Weapon Expertise
Weapon Expertise
Mastery Tree: Ferocity

+10% Armor Penetration.
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if that wa'nt what you wondered about then maybe it is that weapon expertise takes away a % of the enemys armor when you attack to decide your damage against them
100 armor
attack them with weapon expertise it is 100(armor)/10 so it takes away 10 armor
sunder takes away 2/4/6 armor no matter how much armor they have