Neverwinter Nights: Hordes of the Underdark introduces several new prestige classes, including the Shifter, a druidic class specializing in shape shifting; dozens of new feats, such as Epic Reputation, Craft Weapon and Armor Skin; a multitude of new weapons and spells, many designed solely for epic level characters; challenging new creatures pulled straight out of the Underdark, including Mind Flayers, Beholders and Driders; several new character voice sets for even greater character customization; and 17 new epic soundtracks from composer Jeremy Soule.