If this is a repost my bad , but I did not find it yet on the forums.
First of all a welcome Hello.
As the title says it works on Eternion-WoW.I guess in any of their realms , but tried and worked on EverQuest New Realm.
Ok so you first need a druid.Before you do anything else, your call if you want to make the starters quest or not. Teleport to Task Area PvP , And go to druid trainer and choose - Learn all Spells ( The second option.) It dose not matter if you are level 1 , you will automaticcally learn all spells and ranks(Nourish last rank).
Afterwards change form in what ever you want, I tried with all forms and it works.
Ex: Change in bear , than use the little trinket you have in your bag to get into a instance of sort*Do not get out of the bear/moonkin etc form. When you get into the instance, you will be in bear form , tho on top left corner you will not actually see the buff,but the stats and everything is exactly like in bear form. So you can literally be a bear and heal yourself without getting out of bear form. Awsome to kill multiple mobs at once.
Pic.
Imageshack - wowscrnshot041510131641.jpg
As I mentioned above I do not really know if it is a know bug/exploit or not and if it is my apologies for repost.
Enjoy and have a nice day.
Edit. It works on Undamed WoW too.