OK here's the deal. I sit here and watch while you recommend me bands from these particular genres. All are provided with particular examples to help your choice be a more accurate one. Cheers.
Some stoner/doom metal (Heavy Rocks-era Boris, Church Of Misery, Kyuss)
Some folk/viking metal (XIV Dark Centuries, Asmegin, Manegarm)
Some very interesting/unique death metal (Arghoslent, Mithras, Intestine Baalism)
Some very interesting/unique grind or goregrind (Cephalectomy, Lymphatic Phlegm)
Some catchy riffin' power metal (Manticora, Elvenking)
Some NSBM and/or some raw yet melodic BM (Blut aus Nord, Deathspell Omega, Gontyna Kry)
Avoid anything remotely not underground.
Some stoner/doom metal (Heavy Rocks-era Boris, Church Of Misery, Kyuss)
Some folk/viking metal (XIV Dark Centuries, Asmegin, Manegarm)
Some very interesting/unique death metal (Arghoslent, Mithras, Intestine Baalism)
Some very interesting/unique grind or goregrind (Cephalectomy, Lymphatic Phlegm)
Some catchy riffin' power metal (Manticora, Elvenking)
Some NSBM and/or some raw yet melodic BM (Blut aus Nord, Deathspell Omega, Gontyna Kry)
Avoid anything remotely not underground.