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To get the Glory of the Legion Raider you need to obtain all achievements from the Emerald Nightmare and Nighthold raids. The list of achievements include 17 points, by completing them you will get an epic mount – the Grove Defiler. Here you can buy "Glory of the Legion Raider" for EU or US Servers. Also you'll get guide for completing "Glory of the Legion Raider" and can help your friends with these hard quests.
It is a rather harder that it may seem, and we are there for you to do your game process easier.