Hayter's music caught the attention of Profound Lore Records, who re-issued All Bitches Die and released her third studio album, Caligula, in 2019, which was met with universal critical acclaim.

[1] Her undergraduate thesis, titled Architect and Vapor, deconstructed Johann Sebastian Bach's The Well-Tempered Clavier, and centered its poetry component on anorexia, a disorder Hayter had for over a decade.

[2] For her MFA thesis, titled Burn Everything Trust No One Kill Yourself, she created a 10,000-page manuscript (a page count selected because it was approximately Hayter's weight in paper[3]) linking real-world examples of misogyny in music with her own personal life using a Markov chain.

In her own words, it was composed of "lyrics, message board posts, and liner notes from subgenres of extreme music that mythologize misogyny, […] [and] court papers, audio recordings, and police filings from my own experiences of violence.

"[2] In addition to the manuscript, her interdisciplinary performance included music and a black-and-white video projection with footage of serial killer Aileen Wuornos and burning buildings.

The album consists of four "murder ballads" loosely inspired by Angela Browne's 1987 book When Battered Women Kill, a study of victim violence.

[3][4][6] Hayter did not plan to tour in support of the album and only expected to sell a few copies;[7] however, word-of-mouth buzz surrounding All Bitches Die eventually made its way to Chris Bruni, owner of the Canadian extreme metal independent label Profound Lore Records.

[8] After All Bitches Die, Lingua Ignota began working on a full-length album of cover songs that were reinterpreted in her unique music style, often with re-written lyrics.

"[1] A few years prior to its announcement, Hayter formed the supergroup side project Sightless Pit with Dylan Walker (Full of Hell) and Lee Buford (the Body).

[11] The song was a response to the viral "Imagine" video starring Gal Gadot and other celebrities that was intended to boost morale in the early stages of the pandemic but was critically panned.

"[12] Hayter then released three cover song singles: "Jolene" by Dolly Parton in May 2020,[13] "Wicked Game" by Chris Isaak in August 2020[14] and "Kim" by Eminem in October 2020.

[16] In February 2021 she released the EP Agnus Dei, which featured covers of songs by the Seattle punk band Iron Lung and the classical composers George Frideric Handel and Johann Sebastian Bach.

[17] In June 2021, Lingua Ignota shared a new song titled "Pennsylvania Furnace" and announced a new album, Sinner Get Ready, which was released August 6, 2021 on Sargent House.

[24] In December 2022, Hayter founded the Perpetual Flame Ministries record label along with KW Campol of the band Vile Creature, and its first release was the first vinyl pressing of her debut Lingua Ignota album Let the Evil of His Own Lips Cover Him.

"[4] She first became interested in rock music when she found a cassette tape copy of Nirvana's 1991 album Nevermind left behind by her cousin, and became "obsessed" with Kurt Cobain.

[3] By high school, her music tastes evolved into underground, extreme and complex artists including grindcore band the Locust, extreme metal band Cattle Decapitation, free jazz founder Ornette Coleman, experimental noise musician Aaron Dilloway, and avant-garde musician John Zorn.

[1] After reading several books about surviving abuse, she noticed common themes and advice around gentleness, self-love and adopting new hobbies as coping mechanisms, but she felt this "enforced patriarchal models of civilized femininity".

She said: I don't find most of the graphic depictions of (forgive my language here) 'sending this dumb slut back to hell hearing her final screams as my throbbing erection pounds her maggot-filled cunt' upsetting to my feminine sensibilities, most of it isn't even well-executed enough to be taken seriously, I just find that it occupies this weird space of being simultaneously very loaded and totally obsolete, especially when we consider that none of these guys are actually sodomizing female corpses in their free time.

So my thoughts were to flip this whole paradigm and to try to make it meaningful, to reframe extreme imagery for survivors of violence, upon whom very dark shit has actually been visited, and who may have been confronted with the possibility of committing homicide in self-defense to survive an attack.

[2] Hayter delivers vocals "that oscillate between the venomous and aggressive and the heartbreakingly mournful"[3] and loses control of her body on stage, often hitting herself with objects and leaving bruises.

She alleged that, during "one incident of objectifying, violent sex", Marshall had injured her spine and caused a spinal disc herniation, which led to her developing cauda equina syndrome that required surgery.