BioWare now offers The Descent, a new DLC pack to expand Dragon Age: Inquisition with "a new epic story driven adventure alongside a new vast challenging dungeon complex" for the RPG. Details, the official trailer, and other and media are available on this page, and here's word:

The Darkspawn await the Inquisition! Today BioWare has expanded the critically acclaimed RPG Dragon Age™: Inquisition with The Descent downloadable content (DLC). Further extending the single player narrative and gameplay experience, Dragon Age™: Inquisition - The Descent introduces a new epic story driven adventure alongside a new vast challenging dungeon complex for players to explore and uncover some of Theda’s darkest secrets. Dragon Age™: Inquisition - The Descent is available on Xbox One, the all-in-one games and entertainment system from Microsoft, PlayStation®4 computer entertainment system and PC via Origin™ for $14.99.

In Dragon Age: Inquisition – The Descent, players will venture deep below the surface to discover the source of mysterious earthquakes threatening Thedas. As the Inquisitor, players must prepare their companions for a perilous journey in the legendary Deep Roads. Darkspawn-infested caverns will challenge the Inquisition like never before. Memorable new characters will shed light on ancient dwarven history and unique loot and powerful gear will be discovered on each player's path to fight and solve one of Thedas's greatest mysteries.