Close-quarter Fighting

Humanoids with this proficiency have learned to fight in the cramped confines of dungeons and underground lairs. In such locations, or in other extremely close fighting conditions, characters armed with bludgeoning or piercing weapons (or their own natural weapons) receive a +2 bonus to attack rolls. Slashing weapons cannot be used in close-quarter fighting. This bonus is not cumulative with Wild Fighting.

A successful proficiency check at the start of combat yields this bonus. Failure means the humanoid fights normally.

[Complete Book of Humanoids]