You have come to favor a certain prestige class, either because you are particularly devoted to the class’s cause, have trained more than most others have for that specific role, or have simply been destined to excel in the prestige class all along. Regardless of the reason, levels gained in your favored prestige class grant additional benefits in a way similar to those you gain for taking levels in your base favored class.
Benefit(s): Choose one prestige class and one skill that is a class skill for that prestige class. Whenever you gain a level in that prestige class, you receive +1 hit point or +1 skill rank. You gain a +2 bonus on checks using the skill you chose from that prestige class’s class skills. If you have 10 or more ranks in one of these skills, the bonus increases to +4 for that skill. This bonus stacks with the bonus granted by Skill Focus, but does not stack with a bonus granted by any other feat (such as Magical Aptitude or Persuasive).
The choice of favored prestige class cannot be changed once you make it. Levels in a favored prestige class are not the same as levels in a regular favored class, and as such levels in a favored prestige class can never be used to qualify or gain favored class options. You can have only one favored prestige class, but can still have a favored base class as well.
You can select this feat before you gain levels in your chosen favored prestige class, but the benefits of the feat do not apply until you actually gain at least 1 level in that prestige class.
Normal: Prestige classes cannot be a favored class, and cannot benefit from the additional hit point or skill rank afforded to those who take levels in a favored class.