Hey again, the circlet of shadow(s) has a 5 second cast time and it should be 0 seconds, the pre nerf version.
The pre-nerf version is also circlet of shadow (without the s). Here is a link to both:
http://everquest.allakhazam.com/db/item.html?item=26038
http://everquest.allakhazam.com/db/item.html?item=1441
The mob is "a goblin bodyguard" in droga