subquest of Insider Trading
Sumit asks you to use the essence entanglement device on three ghosts at the Ruins of Old Paineel. You can reach the ruins by teleporter if you have completed the Ruined Teleporter quest, or by taking the eastern lift out of Paineel.
Looks like a ghost trap to me, but who ya gonna call?
The device can be used at a safe distance from the ghosts. Use it on three different ghosts (they become non-aggro after using the item). If the ghost you target is one of a group, the others will reset after you entangle your target, but the others do not update. After the 3rd use the device becomes inert.