Oystein Aarseth (Norwegian: ['oystein 'os@t]; 22 March 1968 - 10 August 1993), better known by his stage name Euronymous, was a Norwegian guitarist. Euronymous was a founder of and central figure in the early Norwegian black metal scene. He was a co-founder of the Norwegian black metal band Mayhem. He was also founder and owner of the extreme metal record label Deathlike Silence Productions and record shop Helvete.

In early 1993, animosity arose between Euronymous and Vikernes, and between Euronymous and the Swedish black metal scene.  On the night of 10 August 1993, Vikernes and Snorre 'Blackthorn' Ruch drove from Bergen to Euronymous' apartment at Toyengata in Oslo. Upon their arrival a confrontation began and Vikernes fatally stabbed Euronymous. His body was found on the stairs outside the apartment with 23 stab wounds - two to the head, five to the neck, and 16 to the back. Euronymous' murder was initially blamed on Swedish black metallers by the media.  It has been speculated that the murder was the result of a power struggle, a financial dispute over Burzum records, or an attempt at "outdoing" the stabbing in Lillehammer. Vikernes denies all of these, claiming that he attacked Euronymous in self-defense. He says that Euronymous had plotted to stun him with an electroshock weapon, tie him up and torture him to death while videotaping the event. Vikernes explains: "If he was talking about it to everybody and anybody I wouldn't have taken it seriously. But he just told a select group of friends, and one of them told me". He said Euronymous planned to use a meeting about an unsigned contract to ambush him. Blackthorn stood outside smoking while Vikernes climbed the stairs to Euronymous' apartment on the fourth floor. Vikernes said he met Euronymous at the door and handed him the contract, but when he stepped forward and confronted Euronymous, Euronymous "panicked" and kicked him in the chest. The two got into a struggle and Vikernes stabbed Euronymous to death. Vikernes defends that most of Euronymous' cut wounds were caused by broken glass he had fallen on during the struggle. After the murder, Vikernes and Blackthorn drove back to Bergen. On the way, they stopped at a lake where Vikernes disposed of his bloodstained clothes. The self-defense story is doubted by Faust and other members of the scene.  According to Vikernes, Blackthorn only came along to show Euronymous some new guitar riffs and was "in the wrong place at the wrong time". Blackthorn claims that, in the summer of 1993, he was almost committed to a mental hospital but fled to Bergen and stayed with Vikernes. He said Vikernes planned to murder Euronymous and pressured him into coming along. Blackthorn said of the murder, "I was neither for nor against it. I didn't give a shit about Oystein". Vikernes called Blackthorn's claims a "defense [...] to make sure I couldn't blame him [for the murder]".  Vikernes was arrested on 19 August 1993 in Bergen. Many other members of the scene, including Blackthorn and Faust, were also taken in for questioning. The trial began on 2 May 1994. At the trial it was claimed that he, Blackthorn and another friend had planned the murder. The third person stayed at the apartment in Bergen as an alibi. To make it look like they never left Bergen, he was to rent films, play them in the apartment, and withdraw money from Vikernes' credit card. On 16 May 1994, Vikernes was sentenced to 21 years in prison (Norway's maximum penalty) for the murder of Euronymous, the arson of three churches, the attempted arson of a fourth church, and for the theft and storage of 150 kg of explosives. However, he only confessed to the latter. Two churches were burnt the day he was sentenced, "presumably as a statement of symbolic support". Blackthorn was sentenced to 8 years in prison for being an accomplice.  At Euronymous' funeral, Hellhammer (Mayhem's then-drummer) and Necrobutcher (Mayhem's former bassist) decided to continue with the band and worked on releasing the De Mysteriis Dom Sathanas album. Before the release, Euronymous' family asked Hellhammer to remove the bass tracks recorded by Vikernes. Hellhammer said: "I thought it was appropriate that the murderer and victim were on the same record. I put word out that I was re-recording the bass parts, but I never did". The album, which has Euronymous on electric guitar and Vikernes on bass guitar, was finally released in May 1994.  A part of the Norwegian scene considered Vikernes a traitor for murdering Euronymous and turning his back on Satanism in favor of nationalism and Odinism, although Vikernes claims he was never a Satanist and had only used 'Satan' to provoke. They saw Euronymous' death as a significant loss to the scene, and some black metallers "have sworn to avenge Aarseth's death". A few years after the murder, Ihsahn of Emperor said "There's no discipline in the scene anymore, like earlier on around the shop". After his death, a new generation of musicians tried to gain credibility by 'hyping-up' Euronymous, although he was also hailed as "the King" or "Godfather of Black Metal" by bands that had emerged before this new generation. However, many of Euronymous' friends and bandmates "speak of the killing with a tone of indifference". Lords of Chaos remarks: "what is striking [...] is how little they care about the lives or deaths of one another". In the book, Hellhammer, Ihsahn and Samoth claim that Euronymous' death did not affect or at least not shock them. Anders Odden (a friend of Euronymous at the time) said of the murder: "It wasn't odd that he ended up getting killed. He thought he could threaten to kill people without it having any consequences". He added: "I think many people felt relief once he was gone". Writer and musician Erlend Erichsen agreed, saying "Nobody was there to boss them about. The 'black metal police' were gone".  The book Lords of Chaos says of Euronymous:  He was always dressed in black from head to foot, his hair dyed black for added effect. He sported long, aristocratic mustaches and wore knee-high boots. His black leather biker jacket was decorated with badges [...] When talking, he seemed stern and serious, sometimes with pomposity verging on the theatrical".  In interviews, Euronymous claimed to be against individualism, compassion, peace, happiness and fun. He claimed he wanted to spread hatred, sorrow and evil. In a 1993 interview he said "There is NOTHING which is too sick, evil or perverted". Metalion (who knew Euronymous since 1985 and considered him to be his best friend) said that Euronymous "was always telling what he thought, following his own instincts [...] worshipping death and being extreme". Ihsahn, who frequented Helvete, said that "if you were trusted, if they knew you were serious in your views, you were accepted" there, which was important to be a part of the Helvete scene.  However, Lords of Chaos claims that many who knew Euronymous say "the extreme Satanic image he projected was, in fact, just that - a projection which bore little resemblance to his real personality". They include Kjetil Manheim, Vikernes and Blackthorn. Faust said that with Euronymous, "there was a lot of smoke but not so much fire". When asked why Euronymous made such extreme statements to the press, Ihsahn said: "I think that was very much to create fear among people". He added that the scene "wanted to be in opposition to society" and "tried to concentrate more on just being 'evil' than having a real Satanic philosophy". Mayhem drummer Kjetil Manheim (who was friends with Euronymous from 1983 until his death) described Euronymous as "blond, health oriented, very good at school. He worked-out a lot, didn't smoke, didn't drink ... That was the Oystein we knew. A nice guy, a family guy ... But when we weren't around he could play out his role". Manheim claimed that Euronymous became "extreme" towards the end of his life: "He liked telling people that they were worthless; [that] he was the best. He was all 'I define black metal. Black metal is me!' ... I think he was trapped in the image of Mayhem. He became a megalomaniac". In the documentary Pure Fucking Mayhem he said "Oystein's daily life was a total theater" that was based on the black metal "archetype" of 'Euronymous'. Answer this question using a quote from the following article:

How did Euronymous define Black metal?