Needs review
Source: Races of Stone

Description: You are an expert at avoiding distractions and focusing your mind, and you can concentrate clearly even in the most stressful conditions.

Prerequisites: Concentration (8 ranks)

You can always take 10 on Concentration checks, even when conditions would not normally allow you to do so.

Normal:

A character cannot take 10 on any skill check if distracted or threatened, such as during combat.