BL but don't expect a romance? I'm in, so I subbed!
I don't know if mine is off the beaten path enough to be called as one. While mine does seem kinda stereotype (sword and magic world, prince as main characters, RPG-like world setting), my story do tap to deeper psychological aspect of the characters (not only beat the villain and save the world, even though it's kinda the main plot)
Most of the characters in Eigria: Lume are actually having trauma experience as their own action driver. There are quite mental health issues inside the novel. A character is actually suffering from hallucinations and anger issues, while another is living in deep grief to the point not want to eat and having failed suicidal attempts. There is a man who obssessed with his wife. It'd even dwells in villain's point of view in the future (which also stems from some untreated mental issues).
For me, it's 13+ due to trauma/mental health issues, mild swearing/curses, murder, violence. Current chapters are not tagged mature, but I don't know about the future ones, especially those which would focuses on the characters.
For anyone curious:
Title: Eigria: Lume
Genre: Fantasy, Mystery, Action, Adventure
Short Summary: Cenric always hates his life as the prince of Valria and wishes for change. He never expects the change to turn him into a fugitive who holds the Valria's future while unveils the deepest secret of his kingdom.