Neverwinter Nights 2: Mask of the Betrayer is a role-playing video game developed by Obsidian Entertainment and published by Atari Interactive. It is an expansion pack for Neverwinter Nights 2. It was released in 2007 for Microsoft Windows in North America Europe and Australia. Like the first game Mask of the Betrayer is set in the Forgotten Realms campaign setting of the fantasy tabletop role-playing game Dungeons & Dragons and employs the 3.5 edition rules. Mask of the Betrayer continues the story of Neverwinter Nights 2 by following the main character the Shard-bearer who is afflicted by a curse that requires the devouring of spirits (and occasionally souls) to survive and the character's quest to determine the nature of the curse. The game takes place in two nations of the Forgotten Realms Rashemen and Thay which are considered part of Faerûn's "Unapproachable East".