One acolyte was pierced in the shoulder, a slug punching through ligaments and sending him barking a cry of pain until the second slug ended his life. Another was gunned down with two to the chest, folding in his strange metallic fetishes he wore on his black robes, blood spewing out onto the steel floor. The third had more time to act, arcing his staff at me to send a wave of psychic energy crashing over me as if to crush both my mind and body. I raised my mental defenses and focused my will, redirecting his psychic assault to the 'left' in my mind, though the realm of the mind was much different than physical reality where left and right were not really concepts one could utilize. Before he could regroup for a second assault, I put a round through the center of his head and then fired at Bahometus, only for my autogun to click empty. 

I holstered it with a scowl and sprinted forward, igniting my power sword. Bullets sprang across the steel at my feet and I fired wildly to my left at the heretics across the next alcove, killing one and sending another to the floor with a glancing shot. Even as I whirred back around and found myself bearing down on the helpless sorcerer, red dots of light returned to his visored visage, glowing brighter as he regained his sensibilities. Damn, I wasn't quick enough!

He hissed a sibilant word of power and whipped his hand forward, blue lightning arcing towards me with an attempt to hit center mass. I dropped my autogun and gripped the hilt of my blessed power sword with both hands, crying out a litany of the emperor. The lightning seared into the blade like a rod, the power in the weapon flickering for a brief moment as the warp-lightning was dissipated. It did not stay out, however, the weapon roaring back to life as I got within striking range. Bahometus raised his goat-headed staff, blocking my first swing with the stave. Clearly it was imbued with powerful warp energies if it could survive a single stroke of a power sword. 

I pressed the attack, hacking at his left, only to feint and redirect my blade to scrape across his right shoulder. He screamed with abandon and went to bludgeon me to death, but a quick block and a riposte that clove a jagged line through his chest ended his ambitions to kill me, sending the chaos sorcerer to his knees. Black bile one might mistake as blood oozed from the wound. The staff fell from his fingers, and I looked on with disgust as something slimy and alive wriggled from within his chest cavity. 

Heavy breaths escaped his horned helm, and for the first time in five years I heard his voice. It was intensely deep, and yet held an echo as if he spoke from down a metal corridor. 

"[b]I... am not done, inquisitor. You cannot stop the Changer of Ways[/b]." He warned, drawing in a long, wet breath. "[b]My death is just the beginning. You will know before the end, there is no stopping the Ruinous Gods.[/b]" 

"If your death was just the beginning, you would not have fought back. I won't listen to a lying cur." I spat, my blade twirling in an arc of light that burned the senses before I held it aloft as an executioner, as taught in my physical-exams of the sword. "Bahometus, follower of the dark gods and thrice damned sorcerer of the warp, I, Hadrian Drakos of the Ordo Malleus do sentence you to die. You will receive no last words." 

I did not know if he would have protested. He did not seem to, and without delay or hesitation, I sent my sword down. Not through the neck, but at the top of his skull so I could split him in two and cleave through whatever mutations lay inside of his accursed body. The light from my weapon was blindingly bright, and as my sword hit the steel below, the daemons that fought the xenos grabbed their horned heads and screeched in unison, a sound that pierced into the very brains of all that heard it. Even the abominable intelligences of the necrons were slowed for a moment as the daemons began to ripple like mirages on the desert and fade away into nothingness.