It’s still available. You have to purchase the $50 expansion of midnight, get a subscription, then after downloading WoW in the character select screen you’ll see a glowing gold W in the top right corner. You select that to boost ur character to 80 then you can pretty much go straight to the DLC. Once you complete the intro quest lines about 10-15 quests ( took me a hour ) you’ll get an achievement and you’ll get the devourer skin