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I want something that's really dark and depressive, somewhat relaxed in parts, and also rather chaotic and noise in other parts. I feel like I'm explaining black metal a bit but that's not what I want. I want something post-rock like yet I want it to be really dark and depressive but also want some really chaotic sections.
Your description reminded me immediately of this:
Maybe not so dark, but certainly depressive and moody. The whole album is actually a mix of dark and moody post-rock like parts on one hand and chaotic, noisy and improvisational on another.