well anyway band members from Mayhem made a necklace out of their former bandmate's head
thats just plain heavy right there 
This band has one of the greatest histories of all time, in my opinion. I love reading about all the story behind them, its fascinating. Also, look up the picture of the suicide scene. Pretty brutal, but I don't mind things like that. Rather like it, actually.
Anyways, has anyone heard about Dissection? Their vocalist, Jon, committed suicide. He was a pure satanist for sure, and classified himself as "anti-cosmic". Strangely, the days before his suicide were some of the happiest days he ever had, according to his friends. He didn't commit suicide because of depression or anything like that, he did it because he felt he had achieved all of the goals he had in his life, and took his life to make room for others. Brutal.
Also, Decapitated's drummer (Vitek) died fairly recently... Tragic. He recorded the Winds of Creation when he was only 15 years old. Thats insane.