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ADDING CLASS LEVELS
If you are advancing a monster by adding player character class levels, decide if the class levels directly improve the monster’s existing capabilities.
When adding class levels to a creature, you should give it typical ability scores appropriate for that class. Most creatures are built using the standard array of ability scores: 11, 11, 11, 10, 10, 10, adjusted by racial modifiers. If you give a creature a PC class use the elite array of ability scores before racial adjustments: 15, 14, 13, 12, 10, 8. Creatures with NPC classes use the nonelite array of 13, 12, 11, 10, 9, 8. T
Associated Class Levels
Class levels that increase a monster’s existing strengths are known as associated class levels. Each associated class level a monster has increases its CR by 1.
Barbarian, fighter, paladin, and ranger are associated classes for a creature that relies on its fighting ability.
Rogue and ranger are associated classes for a creature that relies on stealth to surprise its foes, or on skill use to give itself an advantage.
A spellcasting class is an associated class for a creature that already has the ability to cast spells as a character of the class in question, since the monster’s levels in the spellcasting class stack with its innate spellcasting ability.
Nonassociated Class Levels
If you add a class level that doesn’t directly play to a creature’s strength the class level is considered nonassociated, and things get a little more complicated. Adding a nonassociated class level to a monster increases its CR by 1/2 per level until one of its nonassociated class levels equals its original Hit Dice. At that point, each additional level of the same class or a similar one is considered associated and increases the monster’s CR by 1.
Levels in NPC classes are always treated as nonassociated.
ADDING HIT DICE
When you improve a monster by adding Hit Dice, use Table: Improved Monster CR Increase to determine the effect on the creature’s CR. Keep in mind that many monsters that advance by adding Hit Dice also increase in size. Do not stack this CR increase with any increase from class levels. In general, once you’ve doubled a creature’s CR, you should closely watch any additional increases in its abilities. Adding Hit Dice to a creature improves several of its abilities, and radical increases might not follow this progression indefinitely. Compare the monster’s improved attack bonus, saving throw bonuses, and any DCs of its special abilities from the HD increase to typical characters of the appropriate level and adjust the CR accordingly.
Table: Improved Monster CR Increase
Creature’s Original Type CR Increase
Aberration, construct, elemental, fey, giant, humanoid, ooze, plant, undead, vermin +1 per 4 HD added
Animal, magical beast, monstrous humanoid +1 per 3 HD added
Dragon, outsider, nonassociated class levels +1 per 2 HD or 2 levels added
Directly associated class levels +1 per level added
Other Modifiers:
Size increased to Large or larger +1 to CR
Monster’s ability scores based on elite array* +1 to CR
Monster possesses special attacks or qualities that significantly improve combat effectiveness +2 to CR
Monster possesses special attacks or qualities that improve combat effectiveness in a minor way +1 to CR
Template added + template CR modifier
* Do not apply this increase if you advance a monster by class levels. (Monsters advanced by class levels are assumed to use the elite array.)
