Warhammer 40k - Dark Vengeance Novella by C. Z. Dunn

The Dark Angels are among the foremost Space Marines, the First Legion of old. Devastated millennia ago by a dreadful schism, the Dark Angels are constantly on the hunt for the mysterious Fallen, former brothers who have turned from the light of the immortal God-Emperor and embraced the dread powers of Chaos.
Newly-ordained Company Master Balthasar of the Dark Angels leads his forces to the world of Bane's Landing, the resting place of the ancient and powerful Hellfire Stone, in pursuit of the Chaos Space Marines of the Crimson Slaughter. Kranon the Relentless, the evil lord of the Crimson Slaughter, seeks to use the stone to summon forth his daemonic masters and usher in an age of darkness. As the Dark Angels race to stop him, the scene is set for a mighty conflict between the loyal Balthasar and the traitor Kranon.