Top 10 Bands in "Core" Genres that are Metal According to Encyclopaedia Metallum/Metal Archives
Most bands that are in Core Genres I.E. Metalcore, Deathcore, Grindcore etc aren't metal bands according to Encyclopaedia Metallum but some bands from those genres are on Encyclopaedia Metallum either because they played another genre of metal or include more elements than "Core" elements"Core" means Punk
Killswitch Engage is an American metalcore band from Westfield, Massachusetts, formed in 1999 after the disbanding of Overcast and Aftershock. Very accurate observation,christangrant - most of these bands are on there because they played other subgenres that aren't "core" and are metal.
Trivium is an American Heavy Metal band from Orlando, Florida, formed in 1999. Their frontman, Matt Heafy, lead guitarist Corey Beaulieu and Bassist Paulo Gregoletto are the band's most consistent members and have appeared in every album since.Trivium released their debut album, Ember to Inferno, in 2003 under Lifeforce Records. A moderate success, Trivium would later sign to Roadrunner Records a year later and establish further critical and commercial success from there on. They have currently released 8 studio albums. ...read more.
Pretty sure they are on Encyclopaedia Metallum because they also played thrash metal.
Genres: Metalcore/Thrash Metal
Carcass are a British extreme metal band from Liverpool, who formed in 1985 and disbanded in 1995. A reformation was enacted in 2007 without one of its original members, drummer Ken Owen, due to health reasons. I want to explain something. If a band has ever played metal, the band is on Encyclopaedia Metallum, no matter good or bad. There are metal bands that released only one demo with 3-4 songs but if these songs are metal, the band is accepted and has a page on Encyclopaedia Metallum. Encyclopaedia Metallum don't take into account the quality of the songs/albums/bands when accepting them. In this sense acceptance is unbiased. At a 2nd stage reviewers say "good or bad".
I needed to explain this because fanboys/ fangirls of bands that aren't on there (ex., Linkin Park) think that Encyclopaedia Metallum just don't like these bands and this is the reason they don't accept their favorite bands. It's not like that. Encyclopaedia Metallum accept every band that has played metal and this has nothing to do with whether they like the band or not.
They are one of the pioneers of Melodic Death Metal and of course they are on the Metal Archives.
Genres:Goregrind/Grindcore and Melodic Death Metal/Death 'n' Roll
Napalm Death are a British grindcore/death metal band formed in Meriden, West Midlands, England, in 1981. While none of its original members remain in the group, the lineup of vocalist Mark "Barney" Greenway, bassist Shane Embury, guitarist Mitch Harris and drummer Danny Herrera has remained consistent for most of the band's career. Genres:Hardcore Punk, Grindcore and Death Metal
As I Lay Dying is an American metalcore band from San Diego, California. Founded in 2000 by vocalist Tim Lambesis, the establishment of the band's first full lineup, which included drummer Jordan Mancino, occurred in 2001. As I Lay Dying has released six albums, one split album, and two compilation albums.
Carnifex is an American deathcore band from San Diego, California. Formed in 2005, they are currently signed to Nuclear Blast after having been signed to Victory Records and have released five full-length albums and one EP. The name of the band is derived from the Latin: carnifex, meaning "butcher" or sometimes "executioner".
Whitechapel is an American deathcore band from Knoxville, Tennessee. The band is named after the Whitechapel district in East London, England, referencing the series of murders committed by Jack the Ripper.
Cattle Decapitation is an American Deathgrind band from San Diego, California formed in 1996. Cattle Decapitation's songs protest the mistreatment and consumption of animals, the abuse of the environment and touch subjects such as misanthropy and genocide of the human race. Much of their music is based on putting humans in the situations that animals are subjected to, for example animal testing, slaughter, etc. While the band started with an entirely vegetarian lineup, only two current members are vegetarian namely Travis Ryan and Josh Elmore. Genres: Progressive Death Metal/Grindcore
Pig Destroyer is an American grindcore band formed in 1997 in Alexandria, Virginia. The band was formed by vocalist J. R. Hayes, guitarist Scott Hull, and drummer John Evans, later replaced by Brian Harvey. Genre: Grindcore
Heaven Shall Burn are a German metalcore band from Saalfeld, formed in 1996. The band consists of vocalist Marcus Bischoff, guitarists Maik Weichert and Alexander Dietz, bassist Eric Bischoff and drummer Christian Bass. Genres: Metalcore/Melodic Death Metal
Thy Art Is Murder is an Australian deathcore band from Sydney that formed in 2006. The band consists of vocalist Chris "CJ" McMahon, guitarists Sean Delander and Andy Marsh, drummer Lee Stanton and bassist Kevin Butler. They're one of my favourites, especially from Hate onwards. They play more than just blast beats and even venture into traditional death metal territory.
Nasum was a grindcore band from Örebro, Sweden formed in 1992. The band released four studio albums, developed into "one of that country's premier metal acts" and disbanded after the December 2004 tsunami killed the band's frontman, Mieszko Talarczyk.
Darkest Hour is an American melodic death metal band from Washington, D.C., formed in 1995. Though failing to break early in their career, the band has received acclaim for their albums Undoing Ruin, Deliver Us, and The Eternal Return.
Nails is an American powerviolence band formed in 2009 in Oxnard, California. The band has achieved a cult fanbase and is very well received by fans of grindcore and death metal. Nails is currently signed to Nuclear Blast. 
Terrorizer is an American grindcore band formed in 1986 in Los Angeles, California. After disbanding, its members gained recognition by playing in influential extreme metal bands.
Brujeria is a Mexican-American extreme metal band formed in Los Angeles, California in 1989. Their name comes from the Spanish word for "witchcraft".
Brutal Truth was an American grindcore band from Rochester, New York, formed by ex-Anthrax, Nuclear Assault, and Stormtroopers of Death bass guitarist Dan Lilker in 1990. The group disbanded in 1999, but reformed in 2006 and continued to release music until 2014.
Cephalic Carnage is an American deathgrind band formed in 1992 in Denver, Colorado. The band comprises vocalist Lenzig Leal, guitarists Steve Goldberg and Brian Hopp, drummer John Merryman and bassist Nick Schendzielos.
Impending Doom is an American Christian deathcore band from Riverside, California. The group has released five full-length studio albums and are currently a five piece with vocalist Brook Reeves as one of the two original remaining members along with Manny Contreras who left the band in 2010 but returned ...read more.
All Shall Perish is an American deathcore band from Oakland, California, United States, formed in 2002.
All That Remains is an American heavy metal band from Springfield, Massachusetts, formed in 1998. They have released eight studio albums, a live CD/DVD, and have sold over a million records worldwide.
Lamb of God is an American heavy metal band from Richmond, Virginia. Formed in 1994, the group consists of vocalist Randy Blythe, guitarists Mark Morton and Willie Adler, bassist John Campbell, and drummer Chris Adler. I don't consider them a Metalcore band but on Metal Archives it says they are metalcore and groove metal