XP debt

[Reis]

some more powerful races in pathfinder have the xp debt "feature" which states something like "but over time, this lessens"

in 3.5 this was obvious because lower level characters gained more xp encounter than higher ones

in pf a set CR seems to award a set amount of xp no matter what level the characters to overcome it are

what is the mechanism by which this debt lessens as you level up?

[Azure_Zero]

Answers in the Bestiary Appendix 4:

Bestiary wrote:

Appendix 4: Monsters as P Cs

Using one of the monsters presented in this book as a
character can be very rewarding, but weighing such a
character against others is challenging. Monsters are not
designed with the rules for players in mind, and as such
can be very unbalancing if not handled carefully.
There are a number of monsters in this book that do
not possess racial Hit Dice. Such creatures are the best
options for player characters, but a few of them are so
powerful that they count as having 1 class level, even
without a racial Hit Die. Such characters should only be
allowed in a group that is 2nd-level or higher.
For monsters with racial Hit Dice, the best way to
allow monster PCs is to pick a CR and allow all of the
players to make characters using monsters of that CR.
Treat the monster’s CR as its total class levels and allow
the characters to multiclass into the core classes. Do not
advance such monsters by adding Hit Dice. Monster PCs
should only advance through classes.
If you are including a single monster character in a
group of standard characters, make sure the group is of
a level that is at least as high as the monster’s CR. Treat
the monster’s CR as class levels when determining the
monster PC’s overall levels. For example, in a group of
6th-level characters, a minotaur (CR 4) would possess 2
levels of a core class, such as barbarian.
Note that in a mixed group, the value of racial Hit
Dice and abilities diminish as a character gains levels.
It is recommended that for every 3 levels gained by the
group, the monster character should gain an extra level,
received halfway between the 2nd and 3rd levels. Repeat
this process a number of times equal to half the monster’s
CR, rounded down. Using the minotaur example, when
the group is at a point between 6th and 7th level, the
minotaur gains a level, and then again at 7th, making
him a minotaur barbarian 4. This process repeats at
10th level, making him a minotaur barbarian 8 when
the group reaches 10th level. From that point onward, he
gains levels normally.
GMs should carefully consider any monster PCs in
their groups. Some creatures are simply not suitable
for play as PCs, due to their powers or role in the
game. As monster characters progress, GMs should
closely monitor whether such characters are disruptive
or abusive to the rules and modify them as needed to
improve play.