This information is in the user's manual.
1 - Proficient = removes penalty to hit
2 - Specialized = +1 to hit, +2 to damage, +1/2 apr
3 - Mastery = +2 more to hit, +1 more to damage
4 - High Mastery = +2 more to damage
5 - Grand Mastery = Additional 1/2 apr
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