Take A Vehicle Anywhere In The Broken Isles, Powerful AOE Damage (Patreon)

The quest "Lyleth's Champion" (http://www.wowhead.com/quest=43318/lyleths-champion), just under halfway through the Suramar quest chain, offers the player an "empowered disguise". This is effectively a vehicle with a number of interesting abilities, notably "Spiral Splice" - a sort of cross between bladestorm and an actual tornado.

The "empowered disguise" was clearly intended to only be used in the quest zone area on top of a high building. If you jump down normally you are ported back to Lyleth the quest giver. 

However, the first time I did the quest I jumped over the barrier on my left (as the character is facing when ported initially) at the point level with the quest mob Coryn, and managed to jump down into Suramar without getting ported.  I could then travel anywhere with the "empowered disguise" intact and use its abilities. 

When I tried to repeat this glitch I failed repeatedly until I used lag7. So it seems you need to induce lag in some manner to escape the (quite thin) teleport field. Naturally, since I did not use lag7 on the first occassion it seems even a natural lag spike is enough to work. 

This vehicle does not make you invincible but it does do impressive aoe damage. It is removed on any kind of port.