[13] Drummer Peter Haas played in the bands Mekong Delta, Babylon Sad, Calhoun Conquer, Krokus, Clockwork, Ain't Dead Yet, and Coroner.

In 2016, Ralf Winzer Garcia, from the Swiss death metal band Requiem, joined as their new bassist following the departure of Marek Felis in April 2016.

A few months later, on 30 August 2016, Poltergeist announced their upcoming album Back to Haunt would be released in October the same year through Pure Steel Records, and optimistically stated having a well developed sound and better songwriting compared to previous projects.

Back to Haunt has been well received by critics, especially compared to previous projects, with praise particularly for the mature style change, musicianship, and originality of the second half of the album.

had a raw and edgy sound, which included harsh and erratic drum beats and vocals, as well as catchy riffs from the guitars.

Their third album, Nothing Lasts Forever, included more technicality due to star drummer Peter Haas,[20] as well as deeper and more prominent guitar and vocals.