The band released their debut demo
Sickening World in 2015. This was followed by the release of their
EP Pereat Mundus, released on 1 November 2016. After signing with Rising Nemesis Records, their debut album
Purgatorium was released in January 2018. In 2019, Mental Cruelty signed a record deal with the US metal label
Unique Leader Records and released their second album,
Inferis on 10 May 2019. This album was produced by
Sky van Hoff. In March 2021, the band released the single "Ultima Hypocrita" featuring Japanese guitarist Yo Onityan, along with the announcement of their third full-length album,
A Hill to Die Upon, which was released On 28 May 2021. The album's title-track and the third single "King ov Fire" were both released in April 2021. On 2 March 2022, it was announced that Mental Cruelty had signed with
Century Media Records. However, on 28 March 2022 the band announced that they had parted ways with singer Lucca Schmerler after several anonymous allegations of sexual abuse against him were published on
Instagram. Schmerler denied the allegations and stated that he, his friends and family had been threatened since the anonymous allegations. On 24 February 2023, the band announced Lukas Nicolai from Sun Eater as their new vocalist and released two new singles titled "Zwielicht/Symphony of a Dying Star". On 14 April 2023, the band announced their fourth studio album,
Zwielicht, which was released on 23 June 2023, along with the announcement, they also released the single "Forgotten Kings". The third single titled "Nordlys" was released on 25 May 2023. On 17 January 2024, a deathcore band from
Las Vegas named
Ov Sulfur released a single titled "Hivemind" which featured guest vocals from Lukas Nicolai. In October 2024, the band released an orchestral and instrumental version of the track "Mortal Shells" from the
Zwielicht album, also announcing a deluxe version of the album would be released in December. This would then be followed by an instrumental and piano reimagined version of the track "Symphony Of A Dying Star". ==Musical style and influences==