Probably the best of their first three albums, "Servants of Darkness" is more standard Nifelheim. It's largely first-wave black metal with some second wave nuances (some Dissection-y and Wattain-y melodic work, greater use of blasts) and the typical punk attitude. Still not the best thing ever but also lot more fun than most second wavers were at the time, which definitely earn Nifelheim some points. If you like that early Bathory sound, Nifelheim apparently don't disappoint.
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