438a3a28_es___Dungeons_and_Dragons_Wiki__Perk_Benefit
[Perk Name] Concentrated Fire [Pro Perk Benefit] Adjacent allies gain a leadership bonus to attack rolls equal to your charisma modifier [Perk Benefit] 
Adjacent allies gain a leadership bonus to attack rolls equal to 1/2 your charisma modifier.
CoDnD- Call of Duty 3.5 (3.5e Sourcebook)/Chapter 2: New Rules - Dungeons and Dragons Wiki
Perk Benefit