Dark Fantasy deals with the shadow aspect of our humanity through Story. It is lighter than horror in the sense that there may not be much gore or violence, but it’s not entirely horror-free as there are some scenes involving all this.
The themes of Dark Fantasy are also related to the darker aspects of our psyche. Issues like life and death, evil, power, destruction, and killing are famous in this genre, along with all the psychological and emotional baggage that this entails towards the characters.
Morality is experimented with, as well as personal ethics. All of this, of course, set in some sort of fantastical narrative. It’s an interesting underground genre that is still largely unexplored, but nevertheless a hidden gem.