Sundering

Sundering is a weapon upgrade that grants a 10-20% chance of having an additional 20% armor penetration added to an attack. A Sundering upgrade will not add as much damage as a Vampiric upgrade in most situations.

In-game description

 * Armor penetration +20% (Chance: %) or Armor penetration +10% (Chance: %)

Upgrade components which provide this bonus

 * Axe Haft
 * Hammer Haft
 * Sword Hilt
 * Dagger Tang
 * Scythe Snathe
 * Bow String
 * Spearhead