Looking more closely at the rules to add PC classes to monsters, I saw this line:
"The first step of this process is to modify the creature's ability scores. Creatures with class levels receive +4, +4, +2, +2, +0, and –2 adjustments to their ability scores, assigned in a manner that enhances their class abilities."
So if I were to add a level of Barbarian to a Hill Giant I would likely be increasing it's strength by 4 and then giving it the benefits of the class. According to the rules, this would increase its CR by 1. I've never really bothered with giving PC class levels to monsters before, so mostly I'm just fishing for feedback on people's experiences with doing so and how that may potentially change encounters.
In the above example, it seems like adding a synergistic class like Barbarian to a big ol' bruiser like the Hill Giant would likely increase it's CR by more than 1.
What about a Dragon? Say I add a level of Sorcerer to a Dragon. It's casting level effectively increases by one, but it would also benefit from the attribute increase. How does this advantage work in play?
