What album is in your books as being the most heavy of the heaviest heavy album
 
For me it has to be Guttural Secrete's Reek Of Pubescent Dispoilment

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I remember having fun once, it was terrible...

SYMPHONIES OF fucking Sickness
 
It's also one of the best Death Metal albums out there. Listen to Swarming Vulgar Mass of Infected Virulency, Reek of Putrefaction, or Exhume to Consume.

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Crytopsy NoNe So Vile

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And if you gaze for long into an Abyss, The Abyss gazes also into you.
Friedrich Nietzsche

Deicide's second album, Legion. It's perfect, just check out Satan Spawn, the Caco-Daemon or Revocate The Agitator. Compositions are great, also the sound of this record is worth mentioning - it is impossibly crushing. 

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Hails from Poland

Great suggestions and even though Carcass' SOS is probably one of the greatest DM albums I can't consider it heavy.

For heavy, as in crushingly heavy I'd say Witchrist' Beheaded Ouroboros:

Archgoat is another example, but I've heard them described as Blackened Death Metal and Bestial black metal.

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And if you gaze for long into an Abyss, The Abyss gazes also into you.
Friedrich Nietzsche

Correct. Witchrist are Death Metal where Archgoat are Black Metal (though I must admit it's a bit fuzzy at time)/. I know the growls can be confusing but the music is not (been listening to WoB for the past two weeks relentlessly). Same with Hate Forest, for instance, DM vocals but music is Black Metal.

Asphyx - Last one on Earth, shit is heavy as fuck, Asphyx is generally heavy  

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Hails from Poland

 
Really, you don't consider it heavy?
Why not, just for the sake of debate?

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I do album art for bands! Send me a Message or email [email protected] for more info. My website: http://curtisbotham.weebly.com/

I agree. When it comes to heaviness, usually the slower, sludgier Death Metal bands are the heaviest.

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Last.fm: Mercenarion