All Nightmare Long Lyrics Meaning

I personally thought it was about Shadow Over Innsmouth, mainly because of the chorus, "we hunt you down without mercy...", the dude in Shadow was hunted down by cultists to be sacrificed to Cthulhu and Dagon. However now that i look at it, it could be about Call of Cthulhu. "Crawl From the wreckage...", "horrific memory twists the mind", "the light that is not light is here", all of those seem to describe (in that order) the shipwreck, the memory of cthulhu atrophying sanity, and Cthulhu himself, being a creature that is not light or dark, matter or energy and so on. I just dont get "WE hunt you down", if i remember correctly, they were only chased down by cthulhu, maybe its about both, maybe they did it on purpose to confuse us. in Thing that Should Not Be they say "crawling chaos underground, Cult has summoned twisted sound" the twisted sound is obviously cthulhu, but the crawling chaos refers to Nyarlathotep, messenger of the Outer Gods. I think they just got confused there, maybe the same here. i couldnt tell you, but it is freaking awesome to hear decent and somewhat accurate Lovecraft based music. HP may be buried, but this is not dead which can eternal lie. And with strange aeons even death may die, he shall always live, through the legacy he created, and in the far off dreamland of Kadath, HP lives on...