The Darkballs appear in the final mission of each world, those male offspring of female hyenas. I only managed to kill one out of too many of them, and that's even not without spending more than 75% of my AP because of their cheap one-shot kills. -_-
Well, what I always think is that once captured, they will end up that way anyway, so I'd rather respect them by not wasting them as food and thus letting their "sacrifice" be for nothing. And it's not like they are endangered species, so stuff like steamed lobster, chopped live octopus, or foie gras (despite their controversial method of preparation) is nothing when compared to the likes of shark fin soup or those traditional medicine materials made of ground rhino horn, elephant tusk powder, or whatnot. Thinking about that makes me sad and mad at the same time, you see, knowing that endangered species are being hunted and poached for something that has no concrete proof of being effective at all.
It wasn't when it was shipped here. It was when I was travelling... I had to run my bag through the X-ray scanner and that was when it happened, but that's alright. I still have the Dusk, Meow Wow, and Flood ones, and until the Shadow has gone completely missing, I'll still display it on my trusty bag.
By the way, I heard that some areas in the US are expecting heavy snowstorms. I don't know if your area will be affected, but either way, try to stay safe, you hear? If the weather has become noticeably inclement, try not to stay outdoors for too long.