this item is given to you by umm, well i hope one could figure that out. it is given as part of the earthy exterminations 3 task.
simply go into vergalid mines into the flooded cave area and hold this on your cursor. if you are in the correct area but do not have the thing on your cursor you will get this message:
"you need to put the bait rhuk gave you on your mouse cursor"
the correct area is anywhere surrounding the waterfall area past the lakes where you leave behind reptiles and plants and meet up with drakkin.
namely -431, -1608 and -271, -1468.