Other new names on the lineup include grindcore duo Clown Core, Norwegian proggers Leprous, and French psych-rockers Slift. Also announced were Arab Strap, Emma Ruth Rundle, Kalandra, Mew and Green Lung – the last two bands marked as UK festival exclusives.

This new crop of artists will join a bill that features Karnivool as Friday nights headliners, Melvins, Rolo Tomassi, Kylesa, Adebisi Shank, Fall Of Troy and Between The Buried and Me. The festival will take place from August 13 – 16 in at Fernhill Farm in Bristol, with tickets on sale now.

In a press release, James Monteith, guitarist of Tesseract said: “We’re beyond excited to headline the Saturday at Arctangent 2025! The lineup once again boasts some of the most innovative and forward-thinking alternative bands around, and we’re truly honoured to close out the festival. This show will also mark the conclusion of our two-year tour in support of ‘War of Being‘, so we’re planning a very special performance to celebrate this milestone.”

An important part of the “Djent” movement within progressive metal, Tesseract released their fifth studio album, ‘War of Being’ in 2023 to positive reviews, with critics hailing it as their strongest work to date.

On January 10 this year they treated fans with a Tour Edition of their latest album, to coincide with their ‘War of Being Part 2 Tour’ coming in February. This updated version adds three bonus tracks recorded live from their headline set at Radar Festival 2024, featuring Kat Marsh of Choir Noir.

Fellow headliners Wardruna dropped their sixth studio album, ‘Birna’, recently on January 25. Reviewers appreciated its instrumentation and earthly themes, with Silent Radio commenting: “This album does not only transport you to a forest, but it will also leave you in a trance. One which you would not want to get out of.”

Festival organiser and booker James Scarlett expressed his excitement for the 2025 lineup additions: “To have Wardruna, a Main Stage headliner, closing off the Wednesday night of ArcTanGent 2025 truly cements this as our biggest year yet.

“If you can make it to ATG a day early, a 4-Day ticket is now a no brainer. Not to mention Tesseract headlining Saturday night alongside the new additions of Clown Core, Mew, Arab Strap, Envy, Green Lung and tonnes more across the whole weekend. You’re not going to want to miss a second of this weekend – FOMO is an understatement.”

Arctangent has become a crucial festival for platforming post, math, metal and various other progressive rock artists. With a capacity of around 10,000, It’s maintained its charm as a smaller, intimate event, where both upcoming acts and more renowned names are celebrated for their experimental music. Last year, the festival organisers fulfilled a longstanding wish of theirs, featuring Scottish post-rock titans Mogwai as a headliner for Arctangent’s 10^th anniversary.

James Scarlett told MusicRadar: “Doing this without any corporate backing is tough but we’ve got there, and it makes me very proud to sit back and think about all the wonderful times we’ve had. Roll on year 20!”

The Arctangent 2025 lineup and other details can be viewed on the festival’s official website here.

UPDATE 27/3/2025: Arctangent Festival has just announced their final festival headliner for their next event – Godspeed, You! Black Emperor will be performing a European exclusive set on the main stage, returning to Arctangent after a nine year gap. Also newly announced on the bill are Chicago math rockers Snooze, who will be joining the stacked lineup for this year’s edition.

Other acts to be recently confirmed include: Maybeshewill, Frontierer, Mclusky, God Is An Astronaut (as a UK exclusive show), The Callous Daoboys (as a UK exclusive festival show), who all add to the already exciting and eclectic metal lineup.

Having blown critics minds since their creation in 2009, Wardruna have gone from strength to strength with their unique style which uses old Nordic instruments and lyrics sung entirely in Norwegian, devised in a poetic manner. They are most engrossing in  the live format, following a fascinating performance at the 1100 year old Gokstad ship in the Viking Ship Museum in their homeland. This is why there is no better place to host the concert than the Queen Elizabeth Hall, a setting so grandiose and epic that it promises for a night of legendary music  and memories to last a lifetime.

WIth support to come from the equally iconic Icelandic duo of  Steindór Andersen and Hilmar Örn Hilmarsson, who have spent the last two decades exploring the Icelandic tradition of “Rimur Chanting”, consisting of Icelandic poetry from the Viking days, it promises to be a night where the Vikings come back to England for round 2. But this time, we might be welcoming them with open arms and hoping they stay a while.

Wardruna play the Queen Elizabeth Hall on Thursday 24th October, and tickets are available now.