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I've read appendix 2: monster advancement in the Bestiary and have a quick question.
When I add class levels to a monster the first step is to add +4, +4, +2, +2, 0, -2 to its base ability scores (in a manner that is most favourable). Got it.
Now, if I add 5 class levels to a Monster would I also increase one ability by a further +1 (for attaining level 4)? Or is this already factored in with step one?
Doesn't make a huge difference, but was wondering how others felt this should be handled.
I would do everything that classes do, including the ability score increase every 4 levels, as well as favored class bonuses, etc. If a PC or NPC in that class can apply a rule, then so can a monster in that class.
Justification: If you create a classed NPC at a certain CR, that CR assumes the full abilities of the class. Likewise, if you add class levels to a monster that change the CR of the monster, the new CR assumes the full abilities of the class - weakening the class levels will cause your monster to be underpowered at its new CR.
Depends. If the base creature has 4 hit dice to start with, then every 4th class level adds one to an ability score. If the creature has three hit dice then one class level will grant them a plus one followed by an additional bonus every four levels thereafter.