Legendary Artificer

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Barrier Proficiency | Grand Enchanter | Legendary Commander | Augment Summoning | Grand Conqueror

• It makes most of the items perform better, both war items and offensive items, and self-use items.

The numbers associated with this are:

Skill Level 1-5 +1%/lvl
Skill Level 6-10 +2%/lvl

This is as far as I have gotten, but I would assume:
Skill Level 11-15 +3%/lvl
Skill Level 16-20 +4%/lvl

This means that at levels:
1 1% bonus
2 2% bonus
3 3% bonus
4 4% bonus
5 5% bonus
6 7% bonus
7 9% bonus
8 11% bonus
9 13% bonus
10 15% bonus
11 18% bonus
12 21% bonus
13 24% bonus
14 27% bonus
15 30% bonus
16 34% bonus
17 38% bonus
18 42% bonus
19 46% bonus
20 50% bonus

• • Some of the more powerful items (like Ash of Invisibility or Magical Compass) are less or not boosted at all.
• It improves Locate Artifact results
• It is not clear if the skill also impacts unique items.
• It is not clear if the skill improves item generation.

History

• 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).