ADHD rule

[DreadPirateMurphy]

I'm surprised nobody has suggested a penalty to Concentration.

 

[WayneLigon]

What are the rules if the characthers diagonosed with ADHD (Attention Defiant Hyperactivity Disorder)?

I would also think it would depend on the class and perhaps the race. Given that many characters grow up in hostile environments, the environment itself may cull someone unable to concentrate before they get to adulthood. Or just the nature of a more primitive setting than we have now. If they tried to become a mage or fighter, the profession would probably cure them of it before the first year was out since even a moments lapse at a bad time would be fatal.