This skill will increase the effectiveness of your items. Higher levels give a bigger boost.

Effects

Level By Level

Some of the more powerful items (like Ash of Invisibility, Voodoo Doll, or Magical Compass) are less or not boosted at all.
It does not improve effects of Unique Items (tested with Crystal of Tear)

A more detailed list is needed of items that don't work. See discussion page.
On satchels it reduces your own accuracy penalty only. So at level 5 satchels would give you a 9% accuracy penalty, while at level 20 it would give you no penalty. The enemy accuracy penalty is always 10% at all levels.
On beta, the LA bonus to percentage healing items Strange Metallic Can and Pouch of Herbs is reduced. (Start of 2010)

It has improved Locate Artifact results in the past (late 2007), but that was discontinued
This skill replaced the Barrier Proficiency as the skill in December-January 2006-2007.
Barrier Proficiency at that time became a skill, and its workings were also changed.
The replacement probably had something to do with the spell-level effect on barriers being removed between original skill design (late 2004) and reintroduction of skills (halfway 2006).
It used to have odd effects with some items, like causing Satchel of Mist to increase your accuracy penalty instead of decrease it. forum post

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