Favored Vestige Focus
(Tome of Magic, page 74, DnD 3.5)
[General]
The supernatural abilities of your favored vestige are more potent than normal.
Prerequisite
Benefit
The DC of each supernatural ability granted by your favored vestige increases by 1.
Special
You can take this feat multiple times. Its effects do not stack. Each time you take the feat, it applies to a new favored vestige (for which you must have a separate Favored Vestige feat).