Neverwinter Nights has two expansion packs Shadows of Undrentide and Hordes of the Underdark.

It is recommended to play the Original Campaign that comes with Neverwinter Nights first with a new character. Then to play Shadows of Undrentide with a second new character as the storyline runs in parallel with the Neverwinter Nights story. Finally, you can get round to playing the Hordes of the Underdark campaign, use the character you ended Shadows of Undrentide with. The story of Shadows of Undrentide assumes that this is what you have done, as NPC characters make references to your past exploits.

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