NCSUCodeMonkey
Explorer
Sorry if this has been asked recently, I haven't gotten to read as much lately as I would like 
How is everyone dealing with the Spell Miasma from MotW? At first our DM ruled that choking that the spell causes renders the subject incapable of action, but this is obviously too powerful for a fourth level spell, since it is almost guranteed to kill the subject. I suggested that the subject can still act as long as they can hold their breath. Still the spell appears to be somewhat powerful, since it seems like the spell almost gurantees death. For example:
Our Druid is 8th level. She casts Miasma on a subject and it lasts for 40 rounds. Let's just assume the target has a 15 Constitution (not too shabby). He can hold his breath and (under my suggestion) act normally for 30 rounds. Rounds 31-40 he has to make constitution checks, with the last one being DC 20. The penalty of failure is death! Not to mention he only has to roll poorly on one of those 10 saves and he's a gonner!
Now I realize that this is a 4th level spell and that there are other, more instantly lethal, spells of that level: Phantasmal Killer comes to mind. But none of them seem as assured as Miasma.
Is there something I'm missing?
Thanks!

How is everyone dealing with the Spell Miasma from MotW? At first our DM ruled that choking that the spell causes renders the subject incapable of action, but this is obviously too powerful for a fourth level spell, since it is almost guranteed to kill the subject. I suggested that the subject can still act as long as they can hold their breath. Still the spell appears to be somewhat powerful, since it seems like the spell almost gurantees death. For example:
Our Druid is 8th level. She casts Miasma on a subject and it lasts for 40 rounds. Let's just assume the target has a 15 Constitution (not too shabby). He can hold his breath and (under my suggestion) act normally for 30 rounds. Rounds 31-40 he has to make constitution checks, with the last one being DC 20. The penalty of failure is death! Not to mention he only has to roll poorly on one of those 10 saves and he's a gonner!
Now I realize that this is a 4th level spell and that there are other, more instantly lethal, spells of that level: Phantasmal Killer comes to mind. But none of them seem as assured as Miasma.
Is there something I'm missing?
Thanks!