Neverwinter Nights 2: Mask of the Betrayer (also referred to as NWN2:MotB or MotB) is a role-playing video game developed by Obsidian Entertainment and published by Atari. It is an expansion pack for Neverwinter Nights 2. It was released in Autumn 2007 for the PC in North America, Europe, and Australia. Like the first game, Mask of the Betrayer is set in the Forgotten Realms campaign setting of the paper and pencil 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 fictional main character, the Shard-bearer, who is on a quest to determine the nature of a curse that afflicts her/him, forcing her/him to devour spirits (and occasionally souls) in order to survive. The game takes place in two nations of the Forgotten Realms, Rashemen and Thay, which are considered part of Faerûn's "Unapproachable East."
The expansion received generally favorable reviews upon its release. New character traits, such as spells and combat abilities, were welcomed by players, as were the storyline and setting. The game's technical aspects received mixed reception, with some reviewers welcoming the changes and others complaining that the technical glitches present in the original game had still not been addressed. The new "spirit eating" mechanic, which forces players to constantly replenish the main character's life force by sucking out the force of spirits, undead, and gods was not appreciated by many reviewers.
Mask of the Betrayer is an expansion pack for Neverwinter Nights 2 and its core gameplay is identical. The game uses the 3.5 edition rules of the tabletop role-playing game Dungeons & Dragons. Players can create a character from scratch and make use of Mask of the Betrayer's new races, classes, and feats, or import an existing character from Neverwinter Nights 2. Characters must be at level 18 to begin the game. The level cap has been raised from 20 to 30, allowing for epic level characters and accompanying prestige classes and feats. Mask of the Betrayer features all of the races from Neverwinter Nights 2, as well as introducing two types of elves (the wild elf and the half-drow), and four types of genasi. It also contains two new base classes, the "favored soul" and "spirit shaman", and five new prestige classes.