Neverwinter Nights: Shadows of Undrentide is an expansion for the acclaimed role-playing game that enhances the original with a plethora of new features. Players can explore new skills like Tumble and Appraise, and utilize new feats such as Divine Might and Extra Music. The addition of new weaponry, including Holy Water Flasks and Choking Powder, along with prestige classes like Harper Scout, enriches gameplay. Furthermore, it introduces a variety of new monsters from the D&D universe, including Medusa and Female Fire Giant, as well as dozens of new spells to enhance character development.

The expansion also significantly boosts the capabilities of amateur module creators by providing additional content for the Neverwinter Nights Aurora Toolset. This toolset, essential for crafting custom universes and quests, now includes new tile sets for creating diverse environments. Additionally, the introduction of new automated guides, or "Wizards," offers assistance in building and playing player-created adventures, making it easier for fans to engage with the game creatively.