You are particularly good at focusing your mind.

Check: You make a Concentration check whenever you may potentially be distracted (by taking damage, by harsh weather, and so on) while engaged in some action that requires your full attention. Such actions include using skills that provoke attacks of opportunity (such as Disable Device and Treat Injury, among others) while you are in a threatened square. In general, if an action would not normally incur an Attack of Opportunity, you don't need to make a Concentration check to avoid being distracted.

If the check succeeds, you may continue with the action. If the Concentration check fails, the action automatically fails.

The check DC depends on the nature of the distraction.

Try Again?: Yes, though a success doesn't cancel the effects of a previous failure, such as the disruption of an action that was being concentrated on.

Special: By making a check against DC 15, you can use Concentration to attempt an action (such as manifesting a psionic power) defensively, so as to avoid attacks of opportunity altogether. This doesn't apply to other actions that might incur attacks of opportunity (such as moving). If the Concentration check succeeds, you may attempt the action normally without incurring any attacks of opportunity. A successful Concentration check still doesn't allow you to take 10 on a check when you are in a stressful situation; you must roll the check as normal.

If the Concentration check fails, the related action automatically fails (with any appropriate ramifications), and the action is wasted, just as if your concentration had been disrupted by a distraction.

Special: Since Concentration checsk are called for in stressful situations, you cannot take 10 or take 20 on such checks.

A character with the Focused feat gets a +2 bonus on all Concentration checks.

Time: Making a Concentration check doesn't require an action; it is either a reaction (when attempted in response to a distraction) or part of another action (when attempted actively).

Distraction DC Damaged during the action 10 + damage Taking continuous damage during the action 10 + ½ of damage last dealt Vigorous motion such as a bouncy vehicle ride 10 Violent motion such as a very rough vehicle ride 15 Extraordinarily violent motion, such as an earthquake 20 Entangled in a net, snare, etc 15 Grappling or pinned 20 Very rough weather 5 Extremely rough weather 10