Originally Posted by
Zeful
The only problem with that reasoning is that the rules emphatically disagree with it. 3 and 5 level prestige classes have no advancement beyond those levels. Even if the class is poorly written enough to let you take those levels, you wouldn't get anything. +0 Bab, +0 Saves +0 hit points, no special features, nothing, because those levels don't exist in the rules and thus have no benefits. Heck, even gaining the 11th level of a 10 level prestige class requires you to have qualify for the classes Epic advancement so no gaining an 11th level of Horizon Walker at level 16.