Sure, here's an outline for an original fiction book set in a dark, mature fantasy setting:

Title: Shadows of the Forgotten

Chapter 1: The Darkening
• Introduce protagonist, a former soldier turned mercenary named Kael
• Kael arrives in a dark, decaying city where an ancient curse has caused the sun to never rise
• He takes a job to protect a wealthy merchant from mysterious attackers
• Kael discovers that the attackers are shadows, creatures from another realm that feed on fear and despair

Chapter 2: The Shadowlands
• Kael meets a group of rebels who are trying to break the curse and restore the sun
• They tell him about the Shadowlands, the realm of the shadows
• Kael agrees to help them journey to the Shadowlands to find a way to defeat the shadows

Chapter 3: The Lost City
• Kael and the rebels travel through a treacherous wasteland to reach the lost city of the ancients
• There they discover an ancient weapon that can destroy the shadows
• Kael and the rebels are ambushed by a group of dark knights who are also after the weapon

Chapter 4: Betrayal
• One of the rebels betrays Kael and steals the weapon, taking it to the dark knights
• Kael and the rebels are captured and taken to the dark knights' fortress
• Kael discovers that the dark knights are led by his old commander, who has been corrupted by the shadows

Chapter 5: The Final Battle
• Kael and the rebels escape and make their way back to the decaying city
• The dark knights and the shadows launch a massive attack on the city
• Kael and the rebels fight back, using the ancient weapon to destroy the shadows and defeat the dark knights

Chapter 6: The Dawn
• The curse is broken and the sun rises once again
• Kael and the rebels are celebrated as heroes, but Kael decides to leave and continue his mercenary work
• The rebels give him a gift, a rare plant that can only grow in sunlight, as a reminder of their adventure together

Epilogue: Shadows in the Light
• Kael takes a job in a sunny, peaceful land, but discovers that the shadows have found a way to cross over into this realm as well
• He vows to fight them wherever they may appear, and the book ends with Kael preparing for his next battle.
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