Deathcore was spawned basically from metalcore as it was becoming more overplayed and gaining more mainstream popularity. It was around this time that probably some ugly idiots who happened to be at ozzfest saw some metalcore bands playing and conjured up the flawed idea that combining shitty death metal and metalcore as well as dressing up could be "cool" or "cutting-edge".
Also most death metal sucks to begin with, listened to mostly by ugly dudes with long hair who enjoy playing dungeons and dragons and not showering.
Nonetheless deathcore fans are generally posers to both metal(because of the way they dress) and hardcore(because of having no real knowledge of the genre as well as punk rock, DIY, independent media, etc.).
The tail end of metalcore and deathcore mark a sad milestone for the hardcore genre, as this is the first time within almost 30 years of history of the genre that it is being bastardized and exploited in such a way, this has happened to metal numerous times throughout the years but only recently for hardcore.
The worst kind of deathcore people are the girls, these stupid misguided teenagers who've probably been molested by family members growing up or something see listening to shitty music as a gateway to dressing up, being slutty, and gaining attention. These girls have the intelligence of a brick wall and have no exposure or understanding of actual good music.
On a final note many of these bands find it necessary to down-tune their guitars in much the same way as nu-metal.
Deathcore features breakdowns, heavily palm muted riffing, death growls, pig squeals, and technical awesomeness.
Some examples of dXc bands are Suicide Silence, Carnifex, Job For A Cowboy (pre Genesis), Whitechapel, Elysia, and Knights of the Abyss.
Despite many fans' beliefs, deathcore is vastly different from traditional death metal. Musically, the deathcore song structure is generally much more formulaic than that of death metal; songs tend to have one or two guitar riffs, several breakdowns, and possibly a chorus. Deathcore composition is also much less complex, many songs featuring doubled guitar parts or simple guitar harmonies, with the bass guitar being almost entirely indistinguishable.
Possibly the biggest difference between the two genres lies in their production. Deathcore is produced similarly to metalcore in many ways. Clean guitar parts, extremely balanced guitar and vocal tracks, as well as heavily mastered drum tracks tend to cause deathcore and metalcore to sound much like popular hard rock music in terms of production.
(death metal fan): "well i don't really know their music that well but I'm about 99% sure that if i played Suffocation's 'pierced from within' album alongside anything job for a cowboy has put out, it would be pretty clear that they are in fact death core"
(deathcore fan): "..........."
2. "Dude did you see Whitechapel when they opened for c
cannibal Corpse? Talk about a shitty ass deathcore band. I mean, they have three guitar players and they're all playing the same part ?!?!? And I'm pretty sure one of their songs was just four breakdowns in a row."
Generic moderately technical intro
Shity instrument playing with stupid lyrics
Followed by Br00t4l Breakdown
Repeat number 2
ANOTHER FUCKING BREAKDOWN
mike: no i dont listen to deathcore i only listen to hardcore metalcore and emocore
Joe: Hey mike?
Joe: Your a close minded fucking idiot stp labeling music
mike:yourright i should go shootmyself in the face itll be br00tal