From LSWiki

Piercing Resistance is DEAD! R.I.P. It isn't here anymore. Don't bother looking for it in-game.

Class: Physical Conditioning Skills
Attribute: Vitality
Pedagogy: Body Alteration
Specialty Required: Degree I
Hidden Skill

This skill represents the conditioning of one's body to resist being damaged by piercing weapons.

Development Information: The piercing resistance skill was created by Chaos; the
source code was last updated Wed Jan 31 04:34:13 2007.

Trainers

Association:
Kazarak/Kazarzeth: Urdo Wanders
Guild:
Quest: