The Taken King
From Destiny 1 Wiki
Comet: Plague of Darkness is the 3rd and largest expansion for Destiny, scheduled to be released in Q3 2015. Unlike previous expansions, Comet: Plague of Darkness will be in a disc form similar to vanilla Destiny. It will not only increase the base level from 20 to 30 but also add 1 extra subclass for each class. Additionally, Comet: Plague of Darkness will add 2 new types of weapons and a new Patrol location on a Hive ship.
New Missions: 12
New Strikes: 4
New Public Events: 1
New Raids: 1
New Crucible Maps: 6