Kataklysm is a Canadian DeathMetal band formed in 1991. They are very successful by their genre's standards, though not as successful as bands such as Music/CannibalCorpse. Kataklysm started off with a very chaotic brutal death metal sound on their first two albums, ''Sorcery'' and ''Temple of Knowledge''. The former is considered by many to be a classic in the death metal genre, with fans citing then-vocalist Sylvain Houde's diverse vocals, the album's eclectic sound, chaotic riffing, and drumming as definitive strong points. The band was hailed as one of metal's most brutal bands at the time, with a devoted underground following and worldwide critical acclaim from metalheads. However, things began to change when Sylvain left the band.

Then-bassist Maurizio Iacono took over vocal duties, and the band's music went in a more melodic, polished, and simple direction. They also brought in influence from MelodicDeathMetal a few albums in, though the aren't really a part of the genre. While their sound brought in new fans, those who enjoyed their more technical earlier sound did not fully embrace the style. However, Kataklysm still has a strong following in the metal world, as well as a solid 12 albums to their credit. Their sound is often referred to as "Northern Hyperblast" due to their pounding and often very fast drum sections.

Aside from Kataklysm, all of the members also perform as the [[Myth/{{Classical Mythology}} Roman mythology]]-themed band Ex Deo, which, while still rooted in the death metal of Kataklysm, also incorporates [[SymphonicMetal symphonic]] elements in the vein of bands like Septicflesh and Music/{{Fleshgod Apocalypse}}.

The band's 13th album ''Meditations'' was released on June 1, 2018, and they are currently working on their upcoming 14th, ''Unconquered'', for a fall 2020 release. Additionally, Oli Beaudoin left at some point in 2020, and [[Music/HourOfPenance James Payne]] took his place on a permanent basis.

Maurizio has a solo project named Invictus, whose sound combines death metal with both groove and melodic metalcore influences, and also features Mutiny Within singer Chris Clancy on clean vocals. Their first album ''Unstoppable'' was released on October 21, 2022.

Guest Collaborators:
* Mike [=DiSalvo=] (ex-Music/{{Cryptopsy}}) - guest vocals on "Laments of Fear and Despair" (''The Prophecy'')
* Rob Tremblay (Necronomicon) - guest vocals on "Manifestation" (''The Prophecy'')
* Peter Tagtgren (Music/{{Hypocrisy}}) - guest vocals on "For All Our Sins" (''Serenity in Fire'')
* Morgan Lander (Music/{{Kittie}}) - guest vocals on "It Turns to Rust" (''In the Arms of Devastation'')
* Tim Roth (Into Eternity) - guitar on "The Road to Devastation" (''In the Arms of Devastation'')
* Dave Linsk (Music/{{Overkill}}) - guitar on "Blood in Heaven" (''Prevail'')
* Pat O'Brien (Music/{{Cannibal Corpse}}) - guitar on "The Last Effort" (''Prevail'')
* Tuomas Saukkonen (Wolfheart) - vocals on "Cut Me Down" (''Unconquered'')

Ex Deo Collaborators:
* Nergal (Music/{{Behemoth}}) - guest vocals on "Storm the Gates of Alesia" (''Romulus'')
* Karl Sanders (Music/{{Nile}}) - guitar solo on "The Final War (Battle of Actium)" (''Romulus'')
* Obsidian C. (Keep of Kalessin) - additional guitar on "Cruor Nostri Abbas" (''Romulus'')
* Stefan Fiori (Graveworm) - guest vocals on "Per Oculos Aquila" (''Caligvla'')
* Mariangela Demurtas (Music/{{Tristania}}) - female clean vocals on "Divide et Impura" (''Caligvla'')
* Francesco Artusato (Music/{{All Shall Perish}}, Devil You Know) - guitar on "Pollice Verso" (''Caligvla'')
* Spiros Antoniou (Music/{{Septicflesh}}) - guest vocals on "Pollice Verso" (''Caligvla'')
* Brittney Slayes (Music/UnleashTheArchers) - guest vocals on "Boudicca (Queen of the Iceni)" (''The Thirteen Years of Nero'')

[[foldercontrol]]

[[folder: Studio Discography: ]]

* ''Sorcery'' (1995)
* ''Temple of Knowledge'' (1996)
* ''Victims of this Fallen World'' (1998; re-recorded in 2005)
* ''The Prophecy (Stigmata of the Immaculate)'' (2000)
* ''Epic: The Poetry of War'' (2001)
* ''Shadows & Dust'' (2002)
* ''Serenity in Fire'' (2004)
* ''In the Arms of Devastation'' (2006)
* ''Prevail'' (2008)
* ''Heaven's Venom'' (2010)
* ''Waiting for the End to Come'' (2013)
* ''Of Ghosts & Gods'' (2015)
* ''Meditations'' (2018)
* ''Unconquered'' (2020)
* ''Goliath'' (2023)

[[/folder]]

[[folder: As Ex Deo ]]

* ''Romulus'' (2009)
* ''Caligvla'' (2012)
* ''The Immortal Wars'' (2017)
* ''The Thirteen Years of Nero'' (2021)

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! Kataklysm and its members fit these tropes:

* TheAlcoholic: Max Duhamel. He checked himself into rehab because of it.
* [[DeathMetal Brutal Death Metal]]: Most of their material prior to ''In the Arms of Devastation'', especially the two albums with Sylvain Houde.
* CarefulWithThatAxe: Sylvain Houde, and ''how''. Also, on the later material, Maurizio's signature alteration between deep growls and black metal-esque shrieks can be a little surprising to new listeners.
* CrazyHomelessPeople: Sylvain Houde, sadly, as he has been on the street due to untreated schizophrenia for most of his adult life, and people have spotted him shuffling around Montreal while muttering to himself on a semi-regular basis. When an Italian death metal band asked for help with contacting him for a guest appearance in 2018, they were told in no uncertain terms that he was in a bad way and needed to be left alone.
* DarkerAndEdgier: ''Unconquered''. It largely moves away from melodic death in favor of a sound far closer to their early 2000s material, but with more modern influences, which carries over to ''Goliath''.
* GenreShift: From brutal tech-death (Sylvain Houde era material) to straightforward brutal death with melodic elements (from ''Victims of this Fallen World'' through ''Serenity in Fire'') to groove-tinged melodeath (''In the Arms of Devastation'' through ''Meditations'') and finally to pure death metal with djent and groove metal influences (''Unconquered'' onward).
* {{Gorn}}: "The Night They Returned", which is notably their only song to cover the topic, at least blatantly. It was actually set to appear in an independent German splatter/cannibal film of the same name, but ended up being scrapped, though it was unknown if it was written specifically for the movie or not.
* GrooveMetal: While not strictly groove-oriented, they are just as known for their groovy portions as they are their fast blasting sections. Said portions are often compared to elephant marches rhythmically, and have become synonymous with their sound, with Maurizio even stating that some have called the band "the Pantera of death metal". Their groove focused riffs gradually became more prominent over the course of their albums after ''Serenity''.
* IndecipherableLyrics: While Maurizio is one of the clearest singers in death metal at the moment, Sylvain Houde was only seldom able to be understood due to his fast, manic, gruff vocal delivery.
* {{Instrumentals}}: "The Last Effort" from ''Prevail'', which features guitar from [[Music/CannibalCorpse Pat O'Brien]]
* LighterAndSofter: The Iacono era. Not by much, though.
** Their entire catalog after ''Serenity in Fire'' is this, due to dropping the majority of the brutal death elements of their sound in favor of playing up their melodic side.
* LongRunnerLineUp: Only one original member is gone; Sylvain. However, drummer Max Duhamel has left on and off, though he has been with the band forever. As of 2014, he is out again, and it's unclear if he will ever return.
* LoudnessWar: All of their post-Sylvain albums are ''very'' loudly mixed. Even the original version of ''Victims'', recorded in 1998, has this problem.
* MelodicDeathMetal: Have shades of this, especially in their post-''Serenity in Fire'' material, but do not qualify as a full-fledged example. ''Heaven's Venom'' is probably the closest they've come to straight melodeath, along with some songs on ''Waiting for the End to Come''. That being said, Maurizio does not consider the band as such and just calls them "death metal", and ''Unconquered'' saw them move away from the style for the first time in nearly 20 years.
* MetalScream: Sylvain used a frantic and gruff variant of Type 2 with some Type 3s, while Maurizio alternates between Type 3 and a hybrid of Types 1 and 2.
* MultinationalTeam: Maurizio, JF, and Stephane are all from Canada, while James Payne is originally from Italy and currently lives in the US.
* NewSoundAlbum:
** ''Victims'' was strongly influenced by HardcorePunk and was significantly less chaotic and more structured than their previous material due to Sylvain's departure.
** ''The Prophecy'' was a return to their prior brutal death sound, but with a touch of melodeath, which continued up until ''Serenity in Fire''. ''Victims'' was re-recorded in 2005 to match this sound.
** ''In the Arms of Devastation'' dropped most of the brutal death elements in favor of more melodeath, and they have more or less stuck with this since, gradually adding more melody to the point that their sound from ''Heaven's Venom'' onward is close to pure melodeath.
** ''Unconquered'' adds back minor brutal death elements, and introduces 7-strings to their sound with strong groove metal/djent influence as well. ''Goliath'' continues in this direction.
* NoTrueScotsman: Maurizio has expressed this attitude towards deathcore, stating in a 2011 interview that to him it was "not really death metal". However, he has nothing against the genre, as the band have not only toured with several deathcore acts, but he has also stated that they themselves have gotten many deathcore fans into straightforward death metal. This makes sense due to their heavy melodeath influences, with shows up a lot in metalcore as well.
* NobodyLovesTheBassist: Maurizio used to play bass before Sylvain left. Until he became the singer, nobody really knew who he was.
* OlderThanTheyLook: Maurizio is 48, but looks to be in early 30s at most. For evidence, on the ''Iron Will'' documentary he looks, aside from his hair, literally the ''exact'' same in every piece of footage from the ''Victims'' era onward, despite that album being made in '''1998'''.
%%* RatedMForManly: ''In every way.''
* ReligionRantSong: A common lyrical theme, especially Type 3. "Marching Through Graveyards" is a particularly vicious one.
* TheRival: To Music/{{Cryptopsy}}, at least in the beginning of their career.
* TheSchizophreniaConspiracy: Sylvain left the band due to developing schizophrenia. According to his interview on the ''Iron Will'' DVD, it doesn't look like he's recovered from it fully.
* SignatureStyle: Heavily brutal death and melodeath-infused [=OSDM=] with a large emphasis on riffs, blast beats and groove, with lyrics pertaining to real-life issues and mysticism.
* SpecialGuest: [[Music/{{Neuraxis}} Oli Beaudoin]] joined as a temporary session member while Duhamel was in rehab; as of 2014, he has been inducted in as a full-time member after Duhamel decided to step down completely. They've also had a decent number of guests on their albums as listed above their discography section.
* SymphonicMetal: Their work as Ex Deo.
* TechnicalDeathMetal: Started off like this, but dropped just about all elements of it after Sylvain Houde left. According to Maurizio, the reason why they simplified their sound was because they felt that ''Temple of Knowledge'' pushed the limits of their musicality so much that there was no way they would be able to top it. They do have the occasional technical section in some of their material, however.
* ThreeChordsAndTheTruth: Of a sort; while their songs aren't exactly musically simple, they follow a verse-chorus song structure far more often than the majority of death metal bands.
* VocalTagTeam: Even when Sylvain was a member, Maurizio also performed vocals, usually backing him up.
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