Just wondering since their stench is so bad it makes you nauseated instead of sickened (and even if you save you are still sicked). Personally I'd described something like "this creature emits an unbelievable stench, as if every foul odor in the multiverse were immenating from its form"
Have you ever smelled the durian fruit?
so it would smell strongly of sulphur and cadaver....
Whatever it smells like, if you can, it’s too late to run.