https://blood-music.bandcamp.com/album/an-antidote-for-the-glass-pill
Only needed to hear the first 3 tracks to buy this on vinyl. (Plus there were only 2 left so I had to...)
lychgate was formed in 2012 by Vortigern (guitars) with the collaboration of G. A. Chandler (vocals and guitars), Aran (Bass) and T. J. F. Vallely (drums). The debut album, self-titled, was recorded in 2012 and released in the first quarter of 2013. The debut album material was, however, old before it was recorded; based on pre-lychgate material from between 2006 and 2010. The response from the press was nevertheless strong, with very positive reviews being common.
Between January 2012 and December 2013, Vortigern wrote material for the second album entitled An Antidote for the Glass Pill, which was almost entirely recorded at priory studios intermittently in the second half of 2014. After successful sessions it was then offered to the Finnish/USA label blood music (emperor, ihsahn, noneuclid, perturbator, sigh, etc.) who released the work in May 2015. The main focus on this album was with the utilisation of the pipe organ as the backbone to all pieces, where formerly this instrument had only occasional parts to play. To achieve its grandeur and authenticity on recording the band invited Kevin Bowyer to perform the organ parts.
With the second album came a switch to a much more advanced approach to song-writing. The sound which was born represented the meeting of two worlds: the juxtaposition between “correct” harmony (traditional) and departures from it (current). Influences come from classical repertoire (particular the early 20th century era), the musique concréte movement and 1950s–1970s-era cinema. These range from art zoyd and autopsia, to J. S. Bach, Liszt and Messiaen, to classic names in the metal genre spectrum such as bathory, mayhem and abigor.
So... Art Zoyd and Mayhem mixed with a bunch of church organ...
Either Extreme or Avant from my perspective.