Prompt: Imagine a volcanic wasteland choked by toxic fumes and scarred by jagged obsidian rock. Superheated geysers erupt like monstrous boils, spewing magma into the choking ash-filled sky. This is Isstvan V, the battleground where the Dropsite Massacre, a pivotal turning point in the Horus Heresy, unfolded. Chaos erupted as traitor Legions led by the corrupted Warmaster Horus ambushed unsuspecting loyalists. Orbital bombardments rained down, leaving trails of fire across the volcanic plains. Drop pods crashed amongst the loyalist ranks, disgorging traitor Astartes in a wave of screaming fury. Raven Guard, cloaked in shadow, fought a desperate guerrilla war, while Iron Hands, their bodies a fusion of flesh and steel, met the traitorous charge with grim determination. But the tide turned with the arrival of the Word Bearers, unleashing a tide of warp-spawned horrors. Possessed Astartes, their eyes burning with unholy light, hacked through loyalist ranks with unnatural strength. The air filled with the clang of ceramite against ceramite, the shriek of bolter fire, and the agonized screams of the dying. Brother fought brother, oaths of loyalty shattered by betrayal, leaving the volcanic wasteland stained crimson with the blood of Astartes. This was the Dropsite Massacre, a grim testament to the horrors of civil war and the enduring legacy of a galaxy forever fractured.

Style: Cinematic