Hi there,
I am the player Eglanto talked about.
In fact, there is two subjects here. One is about the CR of a kobold as it is written is the rules, the second one is a way to balance the kobold in a group of PC. Only the first one should be addressed in this section.
So, according to the rules,
reference document wrote:
Adding NPCs: Creatures whose Hit Dice are solely a factor of their class levels and not a feature of their race, such as all of the PC races detailed in Races, are factored into combats a little differently than normal monsters or monsters with class levels. A creature that possesses class levels, but does not have any racial Hit Dice, is factored in as a creature with a CR equal to its class levels –1. A creature that only possesses non-player class levels (such as a warrior or adept) is factored in as a creature with a CR equal to its class levels –2. If this reduction would reduce a creature's CR to below 1, its CR drops one step on the following progression for each step below 1 this reduction would make: 1/2, 1/3, 1/4, 1/6, 1/8.
So, a human fighter 3 is CR 2 for example, and a human warrior 3 is CR 1.
Then, we have a look to the kobold and find this text :
reference document wrote:
Kobolds are defined by their class levels—they do not possess racial Hit Dice. A kobold with NPC class levels takes a –3 penalty to its CR (rather than the normal –2 penalty).
So it seems that a kobold fighter 3 is CR 2 and a kobold warrior 3 is CR 1/2.
But if we have a look on some examples, we found
this : a kobold rogue 2 with a CR of
1/2, as if the kobold's CR is defined as its class levels minus 2.
So, the rule question is : what is the CR of a kobold with pc class levels, with npc class levels, with mixed pc and npc class levels, and is the kobold rogue 2 example wrong ?