Neverwinter Nights: Hordes of the Underdark is the second expansion for Neverwinter Nights, hot on the heels of Neverwinter Nights: Shadows of Undrentide. While Neverwinter Nights: Shadows of Undrentide was received by the fans with mixed emotions, Neverwinter Nights: Hordes of the Underdark is just the opposite. This is a great, epic adventure with a good plot and a lot of attention to detail. It's by far the best Neverwinter Nights adventure out of all three thus far. Bioware continues to expand on the 3rd Edition Dungeons & Dragons ruleset. With every expansion we get new classes, feats and skills. Half a dozen new prestige classes make an appearance in Hordes, which include the Weapon Master (my favorite), Dwarven Defender, Champion of Torm, Pale Master, Shifter and Red Dragon Disciple. In addition to new prestige classes, Neverwinter Nights: Hordes of the Underdark introduces 16 new creatures, 4 new tile sets and a slew of new spells and feats. Neverwinter Nights: Hordes of the Underdark is an Epic Level 3rd Edition adventure. You can import your existing Neverwinter Nights character or start a new game with a level 15 character. You can reach up to level 40, although you probably won't break level 30 in most cases. The module itself runs about 20-25 hours, depending on the number of side quests you run.