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–present) 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