@starkatt The Chronicles of Thomas Covenant. They're a hard read, emotionally grueling, and the prose is rather more purple than most people want to deal with these days. The main character is an antihero for the first three books, determined to save his own hide rather than take responsibility. Terrible acts are performed. Beautiful things are destroyed.
But at the end, there's a kind of redemption, and always catharsis for the reader.
@starkatt They were... incredibly formative for me. But oh, I cannot recommend them to very many people!