In Neverwinter Nights 2: Mask of the Betrayer, players are transported back to the Forgotten Realms shortly after the events detailed in the original Neverwinter Nights 2. Following the climactic battle against the King of Shadows, the player awakens alone and stranded deep beneath the earth. Surrounded by a horde of evil spirits, the player embarks on an epic adventure that reveals his true destiny. Set in harsh, spirit-rich Rashemen, near the powerful nation of Thay, Neverwinter Nights 2: Mask of the Betrayer will present players with an exciting new campaign; epic levels; dozens of new feats and spells; new races, base classes and prestige classes; new companions; new weapons, armour and crafting options; hordes of new monsters; and enhanced modding tools.

• Major improvements to the Neverwinter Nights franchise: enhanced graphics, including extensive use of specularity, environment effects, and normal maps; improved performance; streamlined party control; and an easier to use and more powerful toolset. Experience Neverwinter Nights 2 at its best.
• Epic storyline provides the most riveting RPG experience since Planescape: Torment, with the compelling characters and plotlines for which Obsidian Entertainment is renowned. Play the official campaign either alone or online with your friends.
• Stunning new environments include the Astral Plane, sunken Imaskari ruins, a Thayan wizard academy, and the Shadow Plane. Immerse yourself in the Forgotten Realms as you’ve never seen it before.
• Explore an amazingly reactive world, where your decisions affect those around you and the passage of time realistically impacts gameplay.