The God Zehir wants to capture the Forgotten Realms in this expansion, with help from such enemies as the Yuan-ti. It is a completely different story than the two previous installments in this sequel, with a level range of 3-15.
Neverwinter Nights 2: Storm of Zehir is based on Edition 3.5 of the AD&D Rules. New classes include the Swashbuckler as a base class, as well as two new prestige classes: The Doomguide and the Hellfire Warlock.
- The Swashbuckler is a base class similar to the fighter, but uses dexterity instead of strength, as in the feat, weapon finesse.
- The Doomguide is a cleric prestige class focusing on turning undead.
- The Hellfire Warlock is a demonic warlock prestige class that gives the character a flaming visage that works to reflect damage to attackers.
The game also introduces two new races: the Gray Orc which is a somewhat less brutish version of the common Orcs, as well as the Yuan-ti Pureblood which is a humanoid creature with reptilian features. The Yuan-ti has been seen in a previous installment of the Neverwinter Nights franchise; a Yuan-ti was one of the four creatures that must be rescued to cure the wailing death in the first game.