Spoiler Alert: This article or section contains details about plotlines not covered in the anime. Do not proceed unless you wish to be spoiled.
"«Caynz»....!? Is this the way Kains-san's name was written!?" The spelling used for this character's name is confirmed to be official by the author. For specific references, please see Official Naming.
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This article requires:Standardize chronology to better match original light novels, move anime differences to trivia
Diavel had a bronze armor set on his chest, shoulders, arms, and shins, with a large longsword on his left waist, and a kite shield on his back. He had blue hair with long bangs and blue eyes. His clothes under the armor were also blue.
Diavel was a strong and natural leader, having led the raiding group with tactics, resulting with almost no casualties and inspiring fellow players to clear the death game with his speech of determination. However, his personality had a darker side as he secretly tried to use the situation to his own advantage, like attempting to purchase the Anneal Blade from Kirito to reduce his attack power during the boss raid and ensuring that he was assigned to a support role of handling Illfang's minions in order to prevent him from taking the Last Attack (LA) on the boss and then aiming for the LA himself.
Diavel was a beta tester for SAO. Two months after the start of the SAO incident, Diavel became the leader of the raiding group that challenged the 1st Floor boss of SAO.
Secretly desiring prominence and identifying Kirito as his biggest rival, Diavel took steps to hinder Kirito from getting the last attack on the boss monster of the 1st Floor; first by trying and failing to buy Kirito's «Anneal Blade» via Kibaou, and finally by relegating Kirito to the support role of fighting the «Ruin Kobold Sentinels», the boss monster's guards.
During the boss fight, Diavel showed great skill in commanding the raiding group against «Illfang the Kobold Lord», gradually wearing down its Hit Points (HP) with no losses. But as the boss's HP dropped to critical, Diavel charged forward in a bid to land the last attack himself, expecting the boss to switch weapon to a Talwar, which was the case during the beta. The boss instead produced a Nodachi along with a completely different attack pattern. Surprised and too late to react to the change, Diavel was struck down by a devastating combo from the boss.
As his Hit Point bar vanished, Diavel asked Kirito to defeat the boss monster and save the others before dying.
Argo identified that Diavel's name meant Devil in an Italian dialect (Romansch:Diavel).
The anime altered much of Diavel's background, by omitting the points about him trying to buy Kirito's sword to weaken him, and even making sure that Kirito would be assigned the task of handling the boss's minions to ensure that he would not have the chance of dealing the last attack on the boss. Instead, the anime portrayed Diavel as a selfless knight, though it did show him trying to get the Last Attack on Illfang.
Diavel proclaimed himself to be a knight, even though there are no classes in Sword Art Online.