Transpercer
Pierce
Special Ability, Journeys in the Dark
I - Rules
(see JITD, p. 23)
An attack with the Pierce ability ignores 1 point of armor for each rank of Pierce it has. Thus, an attack with Pierce 3 ignores 3 points of armor. Shields are not affected by the Pierce ability.
II - References
Heroes with the Pierce ability: Andira Runehand (magic attack on adjacent enemy only).
Monsters with the Pierce ability: Deep Elves, Dragons, Hell Hounds, Manticores, Shades, Skeletons.
Skills granting the Pierce ability: Eagle Eye (ranged attack only).
Feats granting the Pierce ability: Chink in the Armor (1 ranged attack only).