The two expansion packs available for Neverwinter Nights are Hordes of the Underdark(HotU) and Shadows Of Undrentide(SoU). Each of these expansion packs has an addition of new skills, spells, feats, prestige classes and also provides various resources for your domain name and a new official campaign for the module builders. The Hordes of the Underdark expansion raises its level cap from 20 to 40 and it is later of the expansion packs including the skills, spells, and feats added along with the SoU. The Shadows of Undrentide expansion require access to its prestige campaigns and classes.
These expansion packs are deeply integrated into the game once they are installed. The only consequence is that the new skills, spells, classes, and feats are available to the players in almost all modules they play which includes the original campaign but excludes those which specifically came after the selection. But just keep in mind that no such thing as patching is possible with these packs, unlike some other games. All the installed expansion packs and original game are always equal in number.
The campaign of the expansion starts with a level 1 player character along with a linked story and both these expansion packs have a gameplay of 20 hours each. The HotU campaign lacks multiplayer support. Conversations in the SoU campaign make us feel that it occurs at the same time as the original while the HotU campaign is likely to occur later. The SoU campaign will freely refer to the events within the campaign whereas the HotU campaign features many non-player characters from the original.
The SoU campaign will get the characters to Level 12 whereas the HotU campaign will be started at level 15. This would leave a gap between the levels of the two campaigns and the story line.
OTHER EXPANSIONS
There were many endeavors by the players to expand the level of content in Neverwinter nights. The community expansion pack(CEP) is expected to be the third expansion pack for this game. There are many differences between CEP and SoU/HotU. The most interesting thing is that CEP is free while SoU/HoTU are sold for profit.
