The album furthers Celtic Frost's experimental bent, with unlikely covers choices (Wall of Voodoo's "Mexican Radio"), industrial-tinged tracks ("One In their Pride") and gothic rock tendencies.

A costly legal battle with the label ensued, due to accusations by the band that Noise sabotaged the album's promotion.

During Pandemonium's listening party at SPV's offices Walterbach approached Warrior and asked, "Why don't you try to sound more like Exodus or Slayer?"

With this broadening of horizons, Celtic Frost were adamant that no set of rules would smother their creativity - especially those of extreme metal.

[10] Both Warrior and Ain were post-punk devotees, especially of goth acts Bauhaus, Christian Death, Siouxsie and the Banshees and The Sisters of Mercy.

[11][12] Paradise Lost main composer and guitarist Gregor Mackintosh spotted the Christian Death influence on Warrior's new "whiny" vocal style, used throughout the album.

[14][15][16] Eddy compares "One in their Pride", with its pared down bass, to Adrian Sherwood's production work for Tackhead and Keith Le Blanc.

[19] On the other hand, the lyrics to "Tristesses de la lune" are borrowed from the poem of the same name in Charles Baudelaire's Les Fleurs du mal.

[20] The cover image is a detail from the right (Hell) panel of The Garden of Earthly Delights, a triptych painted in 1504 by Hieronymus Bosch, part of Madrid's Prado permanent collection.

Frost played alongside Anthrax, Metal Church, Crimson Glory, Laaz Rockit and headliners Metallica on February 8.

[23] After the album's release, American guitarist Ron Marks was invited to join the band, in part to bolster its live sound.

There were a number of factors that aided this turn of events: SPV's European distribution network, RCA's promotional push behind Helloween and an enthusiastic metal press.

[25] Thomas Gabriel Fischer finally performed Celtic Frost's requiem at Roadburn 2019 with Triptykon, along with the Metropole Orkest.

"[16] AllMusic reviewer Eduardo Rivadavia considered Into the Pandemonium "one of the classic extreme metal albums of all time.

He preferred Celtic Frost's unorthodox approach to heavy metal "than to be bound to an unwritten book of Underground laws to please others instead of our artistic hunger.

Paradise Lost singer Nick Holmes said "Mesmerized" was his second favorite Celtic Frost song, partly because of how Warrior sang on it.

[33] Anathema's Vincent Cavanagh, later on, would borrow Warrior's moaned-style singing on "Mesmerized" for The Silent Enigma's title track.