At 4th level, you can use a bound vestige to augment your spells by temporarily giving up access to its powers. Using vestige metamagic is a swift action that does not provoke attacks of opportunity.
Choose one of the vestiges to which you are bound whenever you activate this ability. You can then apply the effects of any metamagic feat that you possess to a spell you cast that round, without increasing its spell level. However, you lose access to all the abilities and powers granted by the chosen vestige upon activation and do not regain them for 5 rounds. You cannot use this ability if you do not have a vestige bound, or if you do not currently have access to its abilities (through the use of this ability, an antimagic field, or some other effect). Vestige metamagic is usable once per day at 5th level, two times per day at 7th level, and three times per day at 9th level.