The Most Gamebreaking Arena Exploit In Legion (Sub Rogue) (Patreon)

There is currently a major exploitable glitch affecting subtlety rogues.

Currently when you enter stealth, and use shadowdance with the level 30 talent subterfuge enabled, stealth persists until shadowdance fades. Shadowance can be refreshed 3 times x5=15 seconds, which with other abilities such as vanish and sprint allows the rogue 20+ seconds unseen, by which time all but the most skilled opponents will be dead or close to it. 

This combination of abilities is overpowered and creating an imbalance, probably due to intended interaction. 

Although most obviously useful  for pvp, this exploit has also been used in pve for dps boosting with some  items,  such as the legendary "mantle of the master assassin" which increases critical strike by 100% while stealth is active. 

Additionally this ability has some use for speed-running/mount/gold-farming. Shadowstrike can be spammed in dungeons using this trick, effectively a 15 yard teleport. When macroed with the names of mobs in close proximity this can create very efficient movement within instances.

Unlike the fury warrior glitch (see recent post), the op nature of this glitch and its potential usage in rated arena means it will likely be fixed very soon.