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Defensive CR: determining effective hp due to resistances/immunities
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<blockquote data-quote="pukunui" data-source="post: 6486330" data-attributes="member: 54629"><p>Well, who's to say that they followed their own rules for every monster in the MM?</p><p></p><p>I just had a look at the blue dragon wyrmling (randomly). Without taking the lightning immunity into account, I get a CR of 2.5, which can be rounded up to CR 3. With it, I get CR 3 exactly, so I suppose it could go either way on that one.</p><p></p><p>But still, multiplying just once even if a creature has resistance and immunity helps. Multiplying for them separately produces some crazy results.</p><p></p><p></p><p>EDIT: Taking into account just one immunity or resistance just doesn't feel right to me, though. Take my gargantuan skeletal dragon, for instance. It has 170 hp, an AC of 17, and immunity to cold and poison. It also has Frightful Presence, which increases its effective HP by 25% to 213. If I leave it at that, it has a DCR of 10. If, however, I double its effective HP to take into account the immunities, then its DCR doubles as well to 20.</p><p></p><p></p><p>EDIT 2: Regarding the zombie, are you supposed to count a CR of less than 1 as 1 for the purposes of things like multiplying effective hit points? Otherwise, I'm not seeing how you can even figure it out, as there's no HP modifier for an expected CR of less than 1, and Undead Fortitude has no HP increase for an expected CR of less than 1 either.</p><p></p><p>I'll do the ogre zombie instead. 85 hp + 7 for Undead Fortitude = 92, which is CR 2, but it drops down to a DCR of 1/2 due to an AC of 8. The OCR is CR 2 because of its 13 damage output and its +6 attack modifier. That's a final CR of 1.25, whereas the listed CR is 2. OK, now lets include its poison immunity. 85 * 2 + 7 = 177, which is a DCR of 8, which drops down to 4 because of its AC of 8. 4 + 2 = 6 / 2 = a final CR of 3, which isn't right either. I must be either missing something in my calculations - or some of the monsters in the MM just aren't as "fine-tuned" as we'd like to think they are, going by the DMG's guidelines.</p></blockquote><p></p>
[QUOTE="pukunui, post: 6486330, member: 54629"] Well, who's to say that they followed their own rules for every monster in the MM? I just had a look at the blue dragon wyrmling (randomly). Without taking the lightning immunity into account, I get a CR of 2.5, which can be rounded up to CR 3. With it, I get CR 3 exactly, so I suppose it could go either way on that one. But still, multiplying just once even if a creature has resistance and immunity helps. Multiplying for them separately produces some crazy results. EDIT: Taking into account just one immunity or resistance just doesn't feel right to me, though. Take my gargantuan skeletal dragon, for instance. It has 170 hp, an AC of 17, and immunity to cold and poison. It also has Frightful Presence, which increases its effective HP by 25% to 213. If I leave it at that, it has a DCR of 10. If, however, I double its effective HP to take into account the immunities, then its DCR doubles as well to 20. EDIT 2: Regarding the zombie, are you supposed to count a CR of less than 1 as 1 for the purposes of things like multiplying effective hit points? Otherwise, I'm not seeing how you can even figure it out, as there's no HP modifier for an expected CR of less than 1, and Undead Fortitude has no HP increase for an expected CR of less than 1 either. I'll do the ogre zombie instead. 85 hp + 7 for Undead Fortitude = 92, which is CR 2, but it drops down to a DCR of 1/2 due to an AC of 8. The OCR is CR 2 because of its 13 damage output and its +6 attack modifier. That's a final CR of 1.25, whereas the listed CR is 2. OK, now lets include its poison immunity. 85 * 2 + 7 = 177, which is a DCR of 8, which drops down to 4 because of its AC of 8. 4 + 2 = 6 / 2 = a final CR of 3, which isn't right either. I must be either missing something in my calculations - or some of the monsters in the MM just aren't as "fine-tuned" as we'd like to think they are, going by the DMG's guidelines. [/QUOTE]
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