The band started pre-production on the album with their producer Dan Braunstein via Zoom. In September 2020, Spiritbox announced that they had signed with Rise Records, as part of the label's partnership with Pale Chord Records. The band then paused to assess the situation in the world and decided to release the single 'Holy Roller' in the meantime. The album was initially scheduled for an April 2020 release however, the process was interrupted during the COVID-19 pandemic. The song 'Holy Roller' was written in January 2020 and they performed the unfinished track on a European tour in March. The songwriting for Spiritbox's debut album commenced early, and most of the songs were written throughout 20. Spiritbox said they derived inspiration related to this approach from the 1980s pop music scene, Nine Inch Nails, and early post-punk bands such as the Cure in an interview following the album's release specifically, minimalist 'airy' song structures characteristic of 1980s dark rock served as an important base to the music on Eternal Blue. This approach led Guitar World to describe Spiritbox as 'digitally infused metal' upon the release of what became the album's first single, 'Holy Roller'. The band's use of the digital synthesizer provided a unique sonic aspect to Eternal Blue, displaying aspects ranging from atmospheric to industrial. LaPlante makes use of both screaming and singing throughout the record. Near the release of the record, LaPlante herself defined the musical genre of Spiritbox as metalcore. The record was also labelled 'post-metalcore' and a ' nu-metal-meets-djent riff-fest'. Critics have identified the style on the album as metalcore, post-metal, djent, progressive metal, and alternative metal. Spiritbox employed several heavy metal-based musical styles on Eternal Blue. The band members met Rose only two days before the group began performing with him on a tour that was canceled in March 2020 due to the COVID-19 pandemic. Loerke would depart from Spiritbox in 2020, and was subsequently replaced by Philadelphia-based drummer Zev Rose. It was accomplished through their experience of the DIY recording process, although the mixing and mastering were done in another studio. The band shared five singles which were eventually compiled into an EP titled Singles Collection on April 26, 2019, followed by the non-album singles 'Rule of Nines' and 'Blessed Be' in 20. The band was later joined by Bill Crook of the pop-punk band Living with Lions as bassist, and Shreddy Krueger drummer Ryan Loerke became the band's first permanent drummer. Former Iwrestledabearonce bandmate Mikey Montgomery served as the band's first drummer to record the EP. ДЄs Spiritbox, the couple released a seven-song self-titled debut extended play on October 27, 2017, preceded by the single 'The Beauty of Suffering'. On October 9, 2017, the duo announced the launch of their new project named Spiritbox. LaPlante and Stringer had each replaced a previous member of Iwrestledabearonce, and were never comfortable with that status in the band the two also desired to pursue a new personal and creative direction. In late 2015, they decided to quit the band. Eternal Blue proved an immediate chart success for the band, recording entries in eight countries and debuting at number thirteen on the Billboard 200.Д«efore co-founding Spiritbox, singer Courtney LaPlante and guitarist Mike Stringer were both in Iwrestledabearonce.

Music critics reviewed the album positively, who generally praised its production, songwriting, and musicianship. In advance of the record's release, five songs became singles, 'Holy Roller', 'Constance', 'Circle With Me', 'Secret Garden', and 'Hurt You', all of which have recorded entries on the American Billboard charts. 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 recording was finished by Braunstein in February 2021. Spiritbox relocated to Joshua Tree, California, and completed the songwriting process for the album, which Dan Braunstein and the band's guitarist Mike Stringer produced. Work began in 20 but was suspended due to the COVID-19 pandemic, which delayed the album release initially slated for April 2020. It was released on September 17, 2021, through the band's own Pale Chord Records in partnership with Rise Records. Eternal Blue is the debut studio album by Canadian heavy metal band Spiritbox.

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