Can you just subtract the challenge rating of friendly NPCs?





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The party have bitten off more than they can chew and the DM wants to help them out to avoid a likely TPK by adding a friendly NPC to an encounter. Can they get a good sense of how difficult the encounter now is by simply subtracting that CR of that NPC from the overall encounter total?



A specific example: 4 level 3 characters facing an Oni (CR7). Would adding a Martial Arts Adept (CR3) reduce the encounter to about CR4, a hard but winnable fight?



I'm aware that there will be limits to this approach, 8 martial arts adepts will not stop an ancient red dragon killing a party of level 1 adventurers but does it work as a rule of thumb (if you stick within the same tier of play for example)?










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  • 2




    $begingroup$
    Related: Determining “level” of an NPC ally for purpose of budgeting encounter XP
    $endgroup$
    – Sdjz
    May 6 at 15:25










  • $begingroup$
    Welcome to RPG.SE! Take the tour if you haven't already, and check out the help center for more guidance. Good Luck and Happy Gaming!
    $endgroup$
    – Someone_Evil
    May 6 at 15:26










  • $begingroup$
    I guess that the answer from @purplevermont in that question gives an answer to my question. It feels like that question is coming at it from the other way to this (trying to convert the NPC to PC so you can use the encounter building rules from the DMG and XGtE) where as I'm wondering about just balancing directly in the CR space.
    $endgroup$
    – Carcophan
    May 6 at 15:33


















7












$begingroup$


The party have bitten off more than they can chew and the DM wants to help them out to avoid a likely TPK by adding a friendly NPC to an encounter. Can they get a good sense of how difficult the encounter now is by simply subtracting that CR of that NPC from the overall encounter total?



A specific example: 4 level 3 characters facing an Oni (CR7). Would adding a Martial Arts Adept (CR3) reduce the encounter to about CR4, a hard but winnable fight?



I'm aware that there will be limits to this approach, 8 martial arts adepts will not stop an ancient red dragon killing a party of level 1 adventurers but does it work as a rule of thumb (if you stick within the same tier of play for example)?










share|improve this question









$endgroup$








  • 2




    $begingroup$
    Related: Determining “level” of an NPC ally for purpose of budgeting encounter XP
    $endgroup$
    – Sdjz
    May 6 at 15:25










  • $begingroup$
    Welcome to RPG.SE! Take the tour if you haven't already, and check out the help center for more guidance. Good Luck and Happy Gaming!
    $endgroup$
    – Someone_Evil
    May 6 at 15:26










  • $begingroup$
    I guess that the answer from @purplevermont in that question gives an answer to my question. It feels like that question is coming at it from the other way to this (trying to convert the NPC to PC so you can use the encounter building rules from the DMG and XGtE) where as I'm wondering about just balancing directly in the CR space.
    $endgroup$
    – Carcophan
    May 6 at 15:33














7












7








7





$begingroup$


The party have bitten off more than they can chew and the DM wants to help them out to avoid a likely TPK by adding a friendly NPC to an encounter. Can they get a good sense of how difficult the encounter now is by simply subtracting that CR of that NPC from the overall encounter total?



A specific example: 4 level 3 characters facing an Oni (CR7). Would adding a Martial Arts Adept (CR3) reduce the encounter to about CR4, a hard but winnable fight?



I'm aware that there will be limits to this approach, 8 martial arts adepts will not stop an ancient red dragon killing a party of level 1 adventurers but does it work as a rule of thumb (if you stick within the same tier of play for example)?










share|improve this question









$endgroup$




The party have bitten off more than they can chew and the DM wants to help them out to avoid a likely TPK by adding a friendly NPC to an encounter. Can they get a good sense of how difficult the encounter now is by simply subtracting that CR of that NPC from the overall encounter total?



A specific example: 4 level 3 characters facing an Oni (CR7). Would adding a Martial Arts Adept (CR3) reduce the encounter to about CR4, a hard but winnable fight?



I'm aware that there will be limits to this approach, 8 martial arts adepts will not stop an ancient red dragon killing a party of level 1 adventurers but does it work as a rule of thumb (if you stick within the same tier of play for example)?







dnd-5e encounter-design npc cr-calculation






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asked May 6 at 15:21









CarcophanCarcophan

1384




1384








  • 2




    $begingroup$
    Related: Determining “level” of an NPC ally for purpose of budgeting encounter XP
    $endgroup$
    – Sdjz
    May 6 at 15:25










  • $begingroup$
    Welcome to RPG.SE! Take the tour if you haven't already, and check out the help center for more guidance. Good Luck and Happy Gaming!
    $endgroup$
    – Someone_Evil
    May 6 at 15:26










  • $begingroup$
    I guess that the answer from @purplevermont in that question gives an answer to my question. It feels like that question is coming at it from the other way to this (trying to convert the NPC to PC so you can use the encounter building rules from the DMG and XGtE) where as I'm wondering about just balancing directly in the CR space.
    $endgroup$
    – Carcophan
    May 6 at 15:33














  • 2




    $begingroup$
    Related: Determining “level” of an NPC ally for purpose of budgeting encounter XP
    $endgroup$
    – Sdjz
    May 6 at 15:25










  • $begingroup$
    Welcome to RPG.SE! Take the tour if you haven't already, and check out the help center for more guidance. Good Luck and Happy Gaming!
    $endgroup$
    – Someone_Evil
    May 6 at 15:26










  • $begingroup$
    I guess that the answer from @purplevermont in that question gives an answer to my question. It feels like that question is coming at it from the other way to this (trying to convert the NPC to PC so you can use the encounter building rules from the DMG and XGtE) where as I'm wondering about just balancing directly in the CR space.
    $endgroup$
    – Carcophan
    May 6 at 15:33








2




2




$begingroup$
Related: Determining “level” of an NPC ally for purpose of budgeting encounter XP
$endgroup$
– Sdjz
May 6 at 15:25




$begingroup$
Related: Determining “level” of an NPC ally for purpose of budgeting encounter XP
$endgroup$
– Sdjz
May 6 at 15:25












$begingroup$
Welcome to RPG.SE! Take the tour if you haven't already, and check out the help center for more guidance. Good Luck and Happy Gaming!
$endgroup$
– Someone_Evil
May 6 at 15:26




$begingroup$
Welcome to RPG.SE! Take the tour if you haven't already, and check out the help center for more guidance. Good Luck and Happy Gaming!
$endgroup$
– Someone_Evil
May 6 at 15:26












$begingroup$
I guess that the answer from @purplevermont in that question gives an answer to my question. It feels like that question is coming at it from the other way to this (trying to convert the NPC to PC so you can use the encounter building rules from the DMG and XGtE) where as I'm wondering about just balancing directly in the CR space.
$endgroup$
– Carcophan
May 6 at 15:33




$begingroup$
I guess that the answer from @purplevermont in that question gives an answer to my question. It feels like that question is coming at it from the other way to this (trying to convert the NPC to PC so you can use the encounter building rules from the DMG and XGtE) where as I'm wondering about just balancing directly in the CR space.
$endgroup$
– Carcophan
May 6 at 15:33










1 Answer
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$begingroup$

No, you add the new creature to the allies side of the equation



You wouldn't subtract the CR rating from the enemy - that's still static. What's changed is the party fighting that CR.



You can utilize this question to help determine, roughly, the level of the creature you're adding and then utilize that additional creature and level for your encounter calculations.



The DMG covers this in Chapter 3 under Creating Combat Encounters, or you can utilize online tools like the Kobold Fight Club or Dhmholley's Calculator.



What those tools show:



Originally, the encounter rating would have been Deadly by a fair amount.



By adding the Martial Adept (approximate 10th level) to the party, it changes the rating to Hard (although at the upper limit for that.)






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    1 Answer
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    active

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    1 Answer
    1






    active

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    votes









    active

    oldest

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    active

    oldest

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    12












    $begingroup$

    No, you add the new creature to the allies side of the equation



    You wouldn't subtract the CR rating from the enemy - that's still static. What's changed is the party fighting that CR.



    You can utilize this question to help determine, roughly, the level of the creature you're adding and then utilize that additional creature and level for your encounter calculations.



    The DMG covers this in Chapter 3 under Creating Combat Encounters, or you can utilize online tools like the Kobold Fight Club or Dhmholley's Calculator.



    What those tools show:



    Originally, the encounter rating would have been Deadly by a fair amount.



    By adding the Martial Adept (approximate 10th level) to the party, it changes the rating to Hard (although at the upper limit for that.)






    share|improve this answer









    $endgroup$


















      12












      $begingroup$

      No, you add the new creature to the allies side of the equation



      You wouldn't subtract the CR rating from the enemy - that's still static. What's changed is the party fighting that CR.



      You can utilize this question to help determine, roughly, the level of the creature you're adding and then utilize that additional creature and level for your encounter calculations.



      The DMG covers this in Chapter 3 under Creating Combat Encounters, or you can utilize online tools like the Kobold Fight Club or Dhmholley's Calculator.



      What those tools show:



      Originally, the encounter rating would have been Deadly by a fair amount.



      By adding the Martial Adept (approximate 10th level) to the party, it changes the rating to Hard (although at the upper limit for that.)






      share|improve this answer









      $endgroup$
















        12












        12








        12





        $begingroup$

        No, you add the new creature to the allies side of the equation



        You wouldn't subtract the CR rating from the enemy - that's still static. What's changed is the party fighting that CR.



        You can utilize this question to help determine, roughly, the level of the creature you're adding and then utilize that additional creature and level for your encounter calculations.



        The DMG covers this in Chapter 3 under Creating Combat Encounters, or you can utilize online tools like the Kobold Fight Club or Dhmholley's Calculator.



        What those tools show:



        Originally, the encounter rating would have been Deadly by a fair amount.



        By adding the Martial Adept (approximate 10th level) to the party, it changes the rating to Hard (although at the upper limit for that.)






        share|improve this answer









        $endgroup$



        No, you add the new creature to the allies side of the equation



        You wouldn't subtract the CR rating from the enemy - that's still static. What's changed is the party fighting that CR.



        You can utilize this question to help determine, roughly, the level of the creature you're adding and then utilize that additional creature and level for your encounter calculations.



        The DMG covers this in Chapter 3 under Creating Combat Encounters, or you can utilize online tools like the Kobold Fight Club or Dhmholley's Calculator.



        What those tools show:



        Originally, the encounter rating would have been Deadly by a fair amount.



        By adding the Martial Adept (approximate 10th level) to the party, it changes the rating to Hard (although at the upper limit for that.)







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered May 6 at 15:35









        NautArchNautArch

        67.3k11254450




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