The Masters offer quests as players travel through the world, and grant access to in-game housing and crafting options.
Forsaken Masters (released August 22, 2014) introduced the titular Forsaken Masters, seven NPCs who were also exiled to Wraeclast but have carved a place for themselves with their unique skills.
This expansion also introduced PvP modes and seasonal Challenge Leagues, temporary game realms allowing players to start characters within a fresh economy alongside new gameplay content.
Sacrifice of the Vaal (released March 5, 2014) explored the history of the first civilization on Wraeclast, including special Vaal dungeons that pop up randomly throughout the game levels which provides the player specialized loot related to the Vaal, and access to their former Queen as a Bonus Boss.