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I am designing a Incendiary Cloud trap and I am confused about the CR.
According to the rules for a spell trap that does damage you calculate the average damage (6d6 for 21.5), multiply by 2 as it effects multiple people and multiply by 15 for the 15 round duration for a total of 630 damage which would make the CR of the trap 64.
I am going to use the CR of 9 (for highest level spell effect) but just wanted to check with you guts to see if I am missing something.
That had better give some crazy experience for disarming...
Well the Perception and Disable Device DCs would be 33 (25 + spell level of 8)according to rules for magic traps. My PCs will likely not have to deal with it head on now as they have managed to obtain the password bypass that was placed on it.
In the end I decided to assign it a CR of 14. This was mostly a gut decision as I felt CR 9 too low and the calculated CR of 64 was ridiculous.