Released on 26 June 2020 through Season of Mist,[1] it is a concept album inspired by the life of late 17th-century/early 18th-century German occultist Johann Konrad Dippel, whose controversial experiments with corpses allegedly inspired Mary Shelley's influential 1818 Gothic novel Frankenstein; or, The Modern Prometheus;[2][3] its title is a reference to a Latin epithet adopted by Dippel later in life.

It is also their final release with long-time drummer and founding member Ivo "Namtar" Wijers, who left the band as soon as the recording sessions ended citing "dissatisfactions with the music industry".

On 20 February 2020 the album's title, cover art and tracklist were unveiled, and the song "Monster" was released in advance on 11 March[4] followed by "Der Vampir von Nürnberg" on 24 April[5] and "Operation Compass" on 26 May.

Dom Lawson of Blabbermouth.net rated it with an 8 out of 10, stating that "Franckensteina Strataemontanus feels like a very clear and belligerent demonstration of how sophisticated [Carach Angren's] identity has become", and that even though "black metal purists will probably flinch from this band's overt stylishness and taste for the vivid colors of widescreen horror" and "its sole downside is the fact that we can't currently watch this stuff unfolding on a stage", "that never stopped lots of other bands from being hugely successful.

[9] Elliot Leaver of Distorted Sound rated it with a 7 out of 10, writing that "[T]his is a very fun record, and one that serves as a very fitting swansong for Carach Angren's departing drummer.