Favored Vestige
(Tome of Magic, page 74, DnD 3.5)
[General]
Choose one vestige to which you have access. You establish a close, mystical affinity with that spirit.
Prerequisite
Soul binding
Benefit
Your effective binder level increases by 1 when you use the abilities granted by your chosen vestige.
Special
You can take this feat multiple times. Its effects do not stack. Each time you take the feat, it applies to a new vestige.