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Message: <blockquote data-quote="jgsugden" data-source="post: 8179368" data-attributes="member: 2629">The rules for advancing CR are not an exact science.  An improvement of 2 to ACis very different when going from 11 to 13 or 18 to 20.  My suggestion: Don't bother.  Instead, look up a monster with a similar 'role' that is at the CR you want, and then take the iconic abilities of the monster you want to use and put them on the form of the one that is at the right CR.  If you see something that looks wrong to you after the switch, make tweaks until it feels right - and you'll almost always be just fine.  The game will not break if the creature you make is actually more of a CR 2 monster than a CR 1/2.  You're unlikely to end up with a monster that they can't beat withiut you realizing it.</blockquote>