It is usually suggested that you don't feed your inverts wild caught prey. They could have been around pesticides or other toxins that your scorp is not used to or built up a tolerance too. They could also being carrying a parasite.Where is a good cheap place to order roaches to feed my scorpion?
Also, we tend to get small grasshoppers in my area. Would it be harmful if I fed one to him?
Finally, what prey does an Emperor tend to use its Venom on?