There is probably more hardcore stuff out there but I downloaded Immortal, Burzum, 1349, Behemoth, Barathrum, Darkthrone, Emperor, Nargaroth, and Eternal Tears of Sorrow.
After black metal, I don't think you can get any more hardcore, I have almost reached the limits.
I guess I can go Death metal, but I am very particular on the low death growls.
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