Bugged Item used to escape combat

I’ve found a bugged item to be abused by players in WPvP.
During the night fae campaign you are given a quest to complete “On De Other Side”

This quest provides you with an item called “Deathstone”

This item can be used mid combat, at any zone, in any form of CC (except those that make ur character move), on mount to simply escape the danger u may encounter. (PvP for example) Cast is hidden (no cast-bar can be seen for opposing player) and small (1.5 sec that scales with haste). Cast can be interrupted via damage taken.
Is it possible to add a zone restriction as a simple fix to this item? So it can be only used in Ardenweald and not abused.