The Sacrifice

The Sacrifice is a three-map DLC for both Left 4 Dead and Left 4 Dead 2 and was released on October 5th.

The Sacrifice takes place after Blood Harvest, and is considered to be the prologue to The Passing, as both campaigns are connected to each other. The DLC is free for PC players, while for Xbox 360 players it will be in two separate packages for Xbox Live (one for Left 4 Dead and one for Left 4 Dead 2), and will cost 560 Microsoft Points for each one.

The campaign is called "The Sacrifice", with the obvious interpretation being that one of the Survivors has to sacrifice themself in order to enable the survival of the team. Canonically, Bill is the one who makes this choice, as seen by his unfortunate appearance in The Passing's finale inside a generator room, as well as the comic. The tagline, "It's your funeral", refers to the idiom "it's your funeral", basically meaning someone may have made a bad choice, and if they follow up on it, they will have to endure the direct consequences regarding that choice.

Released in The Sacrifice

 * The Sacrifice campaign for Left 4 Dead and Left 4 Dead 2.
 * A comic book depicting the events that happened after Blood Harvest as well as Survivor back story.
 * Five new Achievements for each DLC.
 * A port of No Mercy for Left 4 Dead 2, which includes usage of the Left 4 Dead Survivors.
 * 5 New Mutations, including: Taaannnkk!! (Left 4 Dead 2 only, PC and Mac is free, for Xbox users who have bought or own The Passing)

Achievements

 * See Main Article: Achievements

Unlike other campaigns, The Sacrifice's Achievements can be obtained separately on both Left 4 Dead and Left 4 Dead 2.