Seriously though check this out:
An Analysis of the Genre: Grimdark, Horror & Dark Fantasy
“'Horror is a story where the protagonist is helpless in the face of a supernatural threat. The protagonist seeks to destroy the supernatural threat in order to save themselves or others, but only when they are forced into a confrontation.'”
"'Dark fantasy is similar to horror in that it is a story where the protagonist is helpless in the face of a supernatural threat. Unlike horror, dark fantasy tends to have a thread of hope running through the story. While at times being helpless, the protagonist generally wins in the end; although the cost (loss of friends/family or even their own innocence) will be great.'"
"'Grimdark is a story where the protagonist faces a supernatural threat, but s/he isn’t helpless against their adversary. Rather than run from the supernatural threat, the grimdark protagonist actively seeks to subvert or control it.'" [...] "One reason grimdark stands out from other subgenres in speculative fiction because, 'the antagonist can be as relatable, or if not more so, than the protagonists. And, you never know if the villain is going to be defeated or the book will end with the world in a worse shape than when it first started.'"
"In all, grimdark can be summarized as: 'a subgenre or a way to describe the tone, style, or setting of speculative fiction (especially fantasy) that is, depending on the definition used, markedly dystopian or amoral, or particularly graphic in its depiction of violence. In most grimdark literature the supernatural is a passive force, controlled by humans—unlike supernatural horror where the preternatural forces are most often an active entity with agency,' (Frohock, 2015). It should be mentioned that the violence depicted in grimdark include: rape, dismemberment, death, torture, all types of abuse, sacrifice, regicide, dark magic, vengeance, etc. This subgenre is not meant for everyone. If you cannot handle more than a few scenes of this sort of violence, then grimdark is NOT for you."