Hmm. King Crimson - Starless is my favourite song ever and I don't really think of it as an "epic" but it's kind of close in some regards. Agalloch - In the Shadow of Our Pale Companion and Summoning - Land of the Dead are incredible songs if you don't mind harsh vocals. I'd put forth Reverend Bizarre - In the Rectory too, just for the hell of it.
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Mistake you're making - overlooking the fact that we might not want to be saved.