Eternal Blue is the debut studio album by heavy metal band Spiritbox. Work began in 2018 but was suspended due to the COVID-19 pandemic. Spiritbox relocated to Joshua Tree, California, and completed the songwriting process for the album, which former Volumes guitarist Dan Braunstein and the band's guitarist Mike Stringer produced. Eternal Blue contains an array of metal genres and subgenres with electronic elements as part of Spiritbox's dynamic, while singer Courtney LaPlante employs both screamed and clean vocals. The release marks the only studio album with bassist Bill Crook.