A rule on a weapon or piece of armor that applies only to someone with the matching expertise. Some grant a benefit; others strip an unwanted trait instead — expertise in Longswords drops the Two-Handed trait, and expertise in Chain Armor drops its Cumbersome trait.

Summary

A rule on a weapon or piece of armor that applies only to someone with the matching expertise. Some grant a benefit; others strip an unwanted trait instead — expertise in Longswords drops the Two-Handed trait, and expertise in Chain Armor drops its Cumbersome trait.