Greater Power Focus (D20 Modern Feat)
From D&D Wiki
Greater Power Focus [Power]
The character excels further in the use of their power.
Benefit: Choose a power skill you have ranks in and have the Power Focus feat for. You get a +3 bonus on all checks involving that power skill. This bonus stacks with the bonus granted from the Power Focus feat.
Special: You can gain this feat multiple times. Its effects do not stack. Each time you take the feat, it applies to a new power skill.