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I'd say Bonded by Blood comes close, but I'm not too knowledgeable about thrashMaybe I haven't gotten 'non-obvious' enough in my thrash explorations, but I can't think of a single non-Metallica/Megadeth/Slayer thrash album that comes close to topping what Metallica, Megadeth or Slayer did imo. Closest thing would be Death Angel, but I still consider them inferior.