Stories I'm still in the process of reading, I don't like to favorite something until I've caught up with or finished it. Sequels and writers I follow religiously are exceptions.
25,000 plus word epics. Most of these lean to the mature side but if you've got time they're all worth the read. "The Immortal Game" being my prime example.
Gore, mental trauma, intense descriptions of violence, horror, and other more touchy things go here. Check descriptions for yourself on individual titles.