Here’s an official overview of how cross-faction play works in World of Warcraft and where it is not allowed. The next World of Warcraft expansion, Dragonflight, was unveiled last month. It will feature a new race (Drachtyr), a new class (Evoker), and the ability to become a Dragonrider. There’s no release date yet, but it will likely launch this Fall. Players will have the ability to find Premade Groups in the Group Finder for dungeons (Normal, Heroic, Mythic, and Mythic+), raids, rated arena/RBGs, and also Torghast. However, the group leader may restrict the listing to same-faction applicants if they choose. Once in a party, members of the opposite faction will remain unfriendly while outside of instances, though they will be able to communicate through party and raid chat, as well as use /say and /yell within proximity of one another. Upon entering a dungeon, raid, or rated PvP match, however, all members will be friendly and able to assist each other in combat, trade loot, earn shared achievements, and otherwise fully engage the same way members of the same faction do.
GUILDS
Guilds will remain single-faction, and random matchmade activities like Heroic dungeons, Skirmishes, or Random Battlegrounds will all remain same-faction.
LEGACY INSTANCES
The functionality of the cross-faction instance feature will also apply to legacy instances and is available at all levels. However, there will be several older instances that cross-faction parties cannot enter due to faction-specific components, and they are:
Trial of the Champion Trial of the Crusader Vault of Archavon Icecrown Citadel Baradin Hold Siege of Boralus Battle of Dazar’alor Darkmaul Citadel (Exile’s Reach dungeon)