Formation and Conclusion of an Age (2000–2009) Sylosis was formed in 2000 by guitarist Josh Middleton and bassist Carl Parnell who began playing
extreme metal with other friends from school. Sylosis released a couple of EPs; 2006's
Casting Shadows and 2007's
The Supreme Oppressor in the UK on a small indie label,
In at the Deep End Records. In December 2007 Sylosis signed with
Nuclear Blast Records, and they released their debut album
Conclusion of an Age in October 2008. After recording their debut studio album, guitarist Gurneet Ahluwalia was replaced by ex-Viatrophy guitarist Alex Bailey, ready for the early 2009 European tour with
The Black Dahlia Murder,
Cephalic Carnage and
Psycroptic. Sylosis were one of the opening acts on the Tuborg (third) stage at
Download Festival held at Castle Donington, along with appearances at the
New England Metal and Hardcore Festival, and an opening slot on the Bohemia stage at
Sonisphere Festival. A UK headline tour was announced for October/November 2009, but was cancelled as the band were offered an opening slot on the
DragonForce UK tour in November/December 2009.
Edge of the Earth, Monolith, and RV Accident (2010–2013) Sylosis replaced
Rise to Remain during the UK leg of
As I Lay Dying's European tour in 2010. Sylosis entered the studio in 2010 to record their second full-length studio album, entitled
Edge of the Earth; it was released in March 2011. They recorded a third studio album titled
Monolith with Romesh Dodangoda in Wales at Monnow Valley Studio.
Monolith was released on 5 October 2012 in Germany, 8 October 2012 in UK & Europe, 9 October 2012 in USA, and 10 October 2012 in Japan via Nuclear Blast Records. Since January 2013 the band have headlined a UK tour as well featuring on the Soundwave Festival in Australia. They also carried out a tour with the bands
Hellyeah,
In Flames and, headliner
Lamb of God in late 2012. The band had a main supporting role on a tour with
Killswitch Engage in Europe during April and May 2013. Sylosis was announced as the opening band for the
Trivium and
DevilDriver North American co-headline tour with
After the Burial as another supporting band. The tour was scheduled for October and November. On 25 September, the members of Sylosis were involved in an RV accident, the injuries from which resulted in the withdrawal of their shows supporting
Trivium and
DevilDriver.
Dormant Heart, departure of Rob Callard, and hiatus (2014–2016) After the members of Sylosis had recovered from their respective injuries, they embarked on a tour of the UK and Europe as main support to
DevilDriver with
Bleed from Within. On this tour Sylosis drummer Rob Callard was unable to play on the tour due to other commitments. Ali Richardson, drummer of Bleed From Within, filled in for the remainder of the tour. In late September 2014 it was announced that Rob Callard was stepping down as drummer of Sylosis after nine years of playing in the band. His replacement was announced at the same time, in the form of Ali Richardson. Richardson's relationship with Sylosis was started on the DevilDriver tour earlier in the year. At the start of October 2014, Sylosis announced details of their fourth album
Dormant Heart, which was released on 12 January 2015 through Nuclear Blast Records. During the second half of May 2015, Sylosis started a European tour with the band
Wovenwar. They also played at several festivals over the summer, such as Graspop Metal Meeting and Hellfest among others. In October 2016, Sylosis announced that they would be going on hiatus as frontman Josh Middleton would be filling in for the British metalcore band
Architects on guitar due to the passing of their guitarist Tom Searle, who was also a close friend of Middleton's. After 11 months of touring with Architects, it was announced that Middleton would be joining Architects as an official member, stating he would still remain in Sylosis.
Return and Cycle of Suffering (2019–2022) In a March 2019 interview, Middleton confirmed that the band remains a going concern and that he intends to release a new Sylosis album in 2019. On 5 December 2019 Nuclear Blast revealed the pre-order for an apparent new record titled
Cycle of Suffering, to be released on 14 February 2020. A day later, the band announced they had returned from their hiatus and confirmed that the new album would be released on 7 February 2020. This was followed by the first single release and music video from the album, titled "I Sever". This was accompanied by the news that long-time bassist Carl Parnell had left the band and had been replaced by Conor Marshall. In promotion of the album, the band supported
Trivium on their "A Light or a Distant Mirror" live concert. This particular concert was held at
Full Sail University and streamed online. The concert did not have a live audience due to the
COVID-19 pandemic. On 11 December 2020, Sylosis released a new single, titled "Worship Decay". On 8 March 2021, Sylosis announced a vinyl release of
Conclusion of an Age and released "Plight of the Soul", a previously unreleased
B-side track from the album. On 3 December 2021, Sylosis released a single titled "Immovable Stone" to which Josh Middleton stated a new album would be released early 2022. On 9 August 2022, Sylosis released the single "Heavy is the Crown", the first of a trilogy of singles to be released in 2022.
A Sign of Things To Come, The Path & New Flesh (2022–present) On 16 March 2023 Sylosis released the single and music video "Deadwood". On 1 June they announced their sixth studio album,
A Sign of Things to Come, along with the single and music video "Poison for the Lost." The title track from the album and an accompanying music video was released on 20 July. The album released on 8 September 2023, along with the music video for "Descent." On 16 January 2024 the band released the music video for the song "Absent." On 3 October 2024 Sylosis surprise-released a new
EP, titled
The Path, along with the video for the title track, which features Debbie Gough of the band
Heriot. One week later, the band announced the departure of longtime guitarist Alex Bailey, with former live guitarist Ben Thomas serving as his official replacement. Ben Thomas then later ended up moving to bass, with Conor Marshall taking on rhythm guitar duties. The band supported
Fit for an Autopsy in the fall in both the United States and Europe. They also did a brief headline tour of Australia in early 2025, with support from
AngelMaker. Sylosis released their seventh album,
The New Flesh, on 20 February 2026. ==Band members==