Decas is the second compilation album by American metalcore band As I Lay Dying.

[10][11] The release of Decas is meant to commemorate As I Lay Dying's tenth anniversary of being a band, and was also described by the group as a gift to their fans for their support over the years.

[10] Coinciding with the release of Decas, As I Lay Dying embarked on the "A Decade of Destruction" tour running from November through December 2011 with openers Of Mice & Men, The Ghost Inside, Iwrestledabearonce and Sylosis.

The track was originally intended to be the iTunes pre-order bonus for As I Lay Dying's previous album, The Powerless Rise.

"War Ensemble" was previously released in a Limited Edition Free Download of the Video Game, Homefront soundtrack.