The Emerald Nightmare is Legion's first raid, opening on September 20th. Created by the titans as a blueprint for Azeroth, the Emerald Dream remained pristine for millennia...until now. Xavius and the Legion have harnessed the corruption stirring in the Dream and seek to use it to take over Azeroth; the earlier chapter in this story takes place in Val’sharah.
Trial of Valor
Since Loken's betrayal, Odyn has been trapped within the Halls of Valor as Helya plots in the shadows to claim the souls of his valarjar champions. In recent days, however, great heroes have arrived in the lands of Stormheim in the Legion's wake. Hoping that their might and determination could tip the scales and end Helya's reign, Odyn summons these champions for a final test.
The Nighthold is located in Suramar. This is the palace from which Grand Magistrix Elisande runs the city of Suramar. She has brokered a deal with the Burning Legion to allow them to use a portion of the Nightwell energy. The entrance can be found in the Sanctum Depths of the Sanctum of Order.