This item is used in the gobblin ring event in the mines of nurga.. find the slave that is being held. they will tell you to find three items.. one is an iron shackle key, the other is a bag of supplies, and the last is the strong restoritive. these items are not hard to get. When you get them be prepared.. the ring event spawns right on top of you. there are 5 goblin sk's and 1 gobblin sergent in the first 5 waves. nothing drops on those waves. on the last wave there is another set of 5 goblin sk's and a named mob that only spawns on the ring event.. some really nice items drop off this event. such as the extended enhancement 3 items clr dru shm. this event cannot be soloed and is a timed event. you have 2 hours to complete the event. as soon as the event is over.. rinse and repeat .. another type prisoner will pop and ask for the same items . different drops will occur each event as far as i know.