Reset All Cooldowns Instantly, Very Valuable For Solo Gold Farming (Patreon)

In 8.1 Archmage Timear outside the Violet Hold in New Dalaran currently offers access to Legion LFR instances. 

If you access "Betrayer's Rise" you will be ported directly to Gul'Dan in Suramar. The first time you do this Gul'Dan will deliver a speech which lasts around thirty seconds or so. After this however he can be attacked. Now drop combat and click on "teleport out of dungeon". You will find that most of your cooldowns have been reset. This means you can have more or less permanent timewarp, bloodlust etc when doing anything in-world, or, for example, soloing dungeons.

Subsequent entries to Betrayer's Rise have no roleplay, so you can attack Gul'Dan instantly. 

This allows you to farm a lot of instances which your ilvl would not normally allow you to farm efficiently, it is roughly equivalent to a significant ilvl boost. For example my ilvl365 mage struggles with farming Freehold trash efficiently or even a full pull of the Seat Of The Triumvirate trash in Argus, with permanent timewarp both are trivial. Note that there is also literally zero time loss using this method because accessing the LFR instance also ports you back to the start of every dungeon which is a major time-saver in itself.

It is possible to use this method with other raids as I've mentioned in previous posts but this is much faster since Gul'Dan can be attacked from the position you are placed in when you port to the raid.