These are the first two parts of The Tomb of Sargeras, which is a lead in to World of Warcraft’s Legion expansion, which drops later this month.
Gul’dan’s efforts to corrupt the Iron Horde on Draenor have ended in failure. The Burning Legion is giving him one last chance to redeem himself by finding the Tomb of Sargeras… but he is already growing tired of the demons’ tight leash.
Khadgar has pursued Gul’dan from Draenor to Azeroth, tracking the warlock all the way to the Broken Isles. There are enemies here, but it might be Khadgar’s allies who give him the most trouble.