I am looking to speak to a GM as soon as possible.
The engineering trinket [Gnomish Cloaking Device] is making the player enter stealth when it is activated whether or not the user is in combat or not. This is WORKING AS INTENDED, but, during a boss encounter it effectively wipes the users threat, using the same mechanic as Vanish that a rogue has. This is all working as blizzlike, but i would like a confirmation from GM before i go and use this in a raid and threaten being banned.
Here is a link to a video of a popular pvp'er using it back in vanilla. He uses it in combat several times but one specific instance starts at 11:40 mark against a warrior.
https://www.youtube.com/watch?v=Mh_cLN66zHA
Note: i am NOT trying to change anything about this item, it is working completely blizzlike (should have mechanics of rogue Vanish). I am only making sure that this is not something that i would be questioned about if used in PvE.