Martial Style Focus (3.5e Feat)
From D&D Wiki
Martial Style Focus [General]
The character's skill in a martial style increases.
Prerequisite: Martial styles ability.
Benefit: Choose one martial style with at least 1 style point. You have a +2 bonus to style level in that style. This does not increase your number of points in that style, it only boosts effects based on style level. The DC to save against any ability granted by that style increases by 1.
Special: You may take this feat any number of times. Its effects do not stack. Each time, you must choose a new martial style in which you have at least 1 point.