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Message: <blockquote data-quote="Alzrius" data-source="post: 1428275" data-attributes="member: 8461">In a word, yes. The wizard in this case is gaining almost nothing (few hit points and skill points) aside from those two spell slots. Given that he already has some for those already, it isn't that much of an increase in power that it alone deserves a CR increase...or is it?Obviously, it is. Likewise, then, the same should hold true for a dragon.Incidentally, you mention that a CR 14 dragon would become a CR 15 creature for only gaining a "couple of third level spells". I decided to try and see where this would apply:A mature adult black dragon is CR 14, and casts spells as a 5th level Sorcerer. Gaining a sorcerer level not only grants it an additional 3rd level spell, but also an additional 1st and 2nd level spell slot also (bonus spells due to high Charisma). And of course, it'd gain three 4th level spell slots...quite a jump in spellcasting power, and more than worthy of a CR increase.Likewise, even if the instance were more generic than that, it'd still be worth the CR increase. A 3rd level spell slot can be used for a fireball, lightning bolt or what have you. It's the same as the superlatives you use for the 18th/19th level mage, just on a lower power-scale. Between that and the skill and hp increase (and depending on when it's taken, feat and/or ability increase), plus the save increase, altogether it does add up to being worth an CR +1.</blockquote>