Seems a bit too niche for the help threads and doesn't fit a particular one.

I'm looking for more like Nyogthaeblisz and Tetragrammacide, just harsh as all fuck war metal with harsh noise thrown in. Not looking for "noisy" metal like revenge, (although that stuff is great so comment away with any hidden gems I guess) but actual noise.

The new Tetragrammacide album is brilliant, but had no real noise to speak of during the actual songs rather than interludes compared to the typhonian wormholes EP. Can't call it a let down cause it's great and I'm listening to it loads, but can't say it's what I was expecting

Intolitarian maybe?

Knelt Rote might be a good suggestion but they utilize more noise interludes I believe than noise in songs which very few bands do (which sucks cause that shit rules). Sect Pig might also fit the bill too (J. Read drums for that band).

Intolitarian is really cool but I always considered them a noisecore band more than anything.

https://www.youtube.com/watch?v=xDd_1J1zZLI

this is possibly even more savage than Tetragrammacide.

Genocide Shrines, although may not quite be noisy enough for what you are looking for.
https://www.youtube.com/watch?v=eu0Bko5ROfQ

Good band, already have their album on vinyl

Not black metal, but the bands Man is the Bastard and Bastard Noise might be something you’re into. Specifically check out “The Red List” and “Thoughtless.”

Triumvir Foul's last album had some noise interludes. Portal also has noise influence, although usually it's not like the harsh/power electronics kind like you seem to be looking for.

Washboard Vomit definitely fits the bill, although I don't think their songwriting is particularly good.