Listening to this recently made me go through the Beherit career catalog. Interestingly, it parallels metal as a whole: first aesthetic innovation, then putting structure to it, then going another level. I think this is why Engram strikes me as so profound: it's on the way to something greater than black metal as we know it.
Oath of Black Blood: I don't actually like this album much. It's a sonic mess that conveys a basic urgency and darkness, but not much else. Still, Beherit figured out their basic approach:compelling, ultra-simple riffs and non-linear (but often nearly binary) song structures.
Drawing Down the Moon: To this formula they add a little bit of death metal, namely abrupt tempo changes combined with surprising riff changes. The use of a bass-heavy (same production as Belial EPs) sound with lots of grit more than distortion in a clean environment, and exploiting the vocals and vocal dynamics in interesting ways, made this an epic WTF-savant album.
Hiv40u812.c Must make something different. First try at ambient is too gimmicky/demonstrative, too conceptual and not musical enough.
Electric Doom Synthesis: They take the instrumentation from the previous album, give it the DDTM treatment, and make a light-footed but hard-hitting album. Good stuff. Perhaps their best so far.
Archgoat split: back to primal and raw riffing, with added sound effects and experimentation of layer on the linear. Still, good, but not great.
Engram: DDTM bested in terms of atmosphere, but subtler, so harder to grasp. Epic song ends it all. Beginning track is weirdly evocative of meditation. I like this album because it is more than it appears to be on all levels, yet does so by being exactly what it appears to be. The level of quirk and pander is very low. Needs the death metal inspired tempo/riff breaks and weirdness of DDTM, but in most cases, the riffs themselves are more grown-up (find a good synonym, sure) here. Really an evolution on DDTM and EDS, but with more of their intensity and atmosphere, could go even farther.
HIgh hopes for the future.