The Dark Below

The Dark Below is the first of two confirmed DLCs for Destiny. It will be set in the Hellmouth and will involve stopping a dark god Crota who has risen an army of Hive. Story, Strike, and missions from other modes will be added, along with new gear, armor, and weapons. Some of this attaches to pre-existing locations. Due to a glitch in the game it has been seen that Bungie's current additions for this expansion will contain multiple story missions, 2 Strikes and 1 Raid. More multiplayer maps can be expected.

It will be released in December, 2014.

Trivia
The trademark for the expansion was filed in 2013. Activision had Blizzard Entertainment file the trademark, which led to some confusion as to whether the expansion was related to World of Warcraft.