Zhentarim Attuned

Overview
''Zhentarim Attuned: This item has been attuned by the the Zhentarim mage, Whisper. It can be upgraded with Zhentarim Black Stones.''
 * Introduced in Update 21.
 * Gather Black Stones from The Haunted Halls of Eveningstar chests.
 * Place Black Stones and the named item in the Zhentarim Improvement UI to upgrade the named item to a more powerful form.
 * You can preview the available upgrades by double-clicking on a Black Stone.

Zhentarim Attuned upgrades
Used to upgrade items obtain from The Haunted Halls of Eveningstar.
 * Location: Double-Click on Black Stones while in the character's inventory.
 * Items require 150 Black Stones to be upgraded.