announced to play UK Tech-Metal Festival as the main headliner on 14 June 2014. They were also main headliner of Silence Festival V in Nepal 17–18 October 2014,sharing same stage where Enigmatik, Vader, Textures and Behemoth had headlined before. On 27 April 2015 Sikth announced via their Facebook page that they are planning to release new music in the form of a crowd funded EP with a tour to follow. Fans who pre-ordered the EP were able to visit the pledgemusic page and gain access to exclusive updates, content and merchandise for the duration of the funding campaign. The six track EP, titled Opacities, was released on 4 December 2015. Sikth were also the opening act for Slipknot on their 2016 U.K tour in February alongside Suicidal Tendencies. They were announced to be performing the Arctangent Festival in August 2016, but later pulled out. They appeared in 2017. On 3 June 2016 Justin Hill announced his retirement in order to focus on his production career. Joe Rosser from Pin's second band Aliases was announced as his replacement. The band will be in the UK in September for their "Riddles of Humanity" tour and will feature Loathe as their support act in September 2018. Their final show of the year was at Festivile on 20 October 2018, it was also at this show where frontman Mikee Goodman said that "This will be the last show we'll do for a while" he also stated he is unsure if they will return soon and if new music will be made. Sometime between 2019 and 2021, Joe Rosser departed the band to pursue other musical endeavours, in late 2022 the band announced that Justin Hill would rejoin the band for a set of anniversary shows in November 2022, at the Manchester date of the show the band brought out Joe Rosser for the songs "Sanguine Seas of Bigotry" and "Bland Street Bloom" as a thank you to his tenure in the band when Justin departed. Musical style SikTh's style of music is hard to categorise as they incorporate many different elements of metal, rock and hardcore. They are commonly categorised as progressive metal due to their unorthodox approach, as well as avant-garde metal and mathcore due to the complex nature of their instrumental playing abilities and the regular inclusion of dissonance into their music. According to guitarist Dan Weller; "Energy has always inspired us,