Dark fantasy is about cost
Bright fantasy asks whether the hero will win. Dark fantasy asks what winning will take. Every spell has a price, every crown has a body under it, and the people we follow are rarely clean. Type your world in a sentence and the AI asks about the cost: who pays for the magic, what your lead has already done that they cannot undo, and whether the first chapter should end in a bargain or a betrayal.
Grim, but never cruel for its own sake
Onyx is the writer chosen on this page, because he likes a dangerous turn and keeps a cold, steady voice, but Spicy, Pyra and No Writer are there if you want a warmer tone. Choose a chapter of about 500 words for a single tense scene, or several thousand for a court full of schemes. The heat runs from none to adults-only levels for readers 18 and over, every character is an adult, and the story is written in the full writing app after a free sign-up. Each chapter remembers every oath and every grudge from the last.