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Message: <blockquote data-quote="MostlyDm" data-source="post: 6859145" data-attributes="member: 6788973">Given advanced tactics, you can dramatically change the challenge level without actually changing any CRs by the guidelines (e.g. Without changing damage/HP)As I mentioned earlier, adding an immunity does not change the CR calculation. Nor does adding spells that do not deal more expected damage than their existing attacks (but could be especially effective when using AOE combined with immunity, as with the Slaad.)Adding mobility also does not increase a monster's CR. For example: if you want to challenge a very ranged heavy party and you give your Marilith a bonus action long distance teleport, the CR is unchanged. I'm honestly a little baffled that you consider this stuff outside the scope of the experiment. I thought the experiment was to craft a challenge without going over the XP limits into multiple times Deadly, using the standard rules. Modifying monsters is absolutely part of the standard rules, though. It's right there in one of the three core books, in black and white. Or, black and gray and sepia, or whatever.</blockquote>