Added to Homebrews.
I assumed "Cha 0" was a typo, since earlier it was mentioned using the GBB's Cha 9.
So, is the stench always active or an area effect? If the latter, usages per day?
Seems to me like the original stench (though a death throes) was a 10 ft cone, so we should stick to that. I could go anywhere from 3/day to at will.
How about the following?
Stink Spray (Ex): 3/day, a giant stink beetle can spray a 10 ft cone of odoriferous chemicals. Any creature caught in the cone must make a DC X Fort save or be sickened for 1d6+4 rounds. If the victim possesses the Scent special quality, it is instead nauseated for 1d6 rounds and then sickened for 2d6 minutes. The save DC is Constitution-based.
Death Throes (Ex): When a giant stink beetle dies, it releases a stink spray attack instantly, regardless of how many times it has used that special attack that day.
temperate forests
Cluster (2–5) or click (6–11)
toughish CR 2
4-6 HD (Medium), 7-9 HD (Large)
6 to 7 ft

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.