Crow growled. "You've made some changes. After I abandoned you filth? Maybe there's a chance you'll actually be worth the name they call you. Chaos Marines." Her eyes glowed a bloody red color, and swirled, purple sparks in a red fog. The sparks seemed to be part of the eye, just 2D- but it wasn't clear whether or not they really were.
She let loose a guttural howl, and her muscles seemed to bulge, her nails growing, resembling hooks. The skin on her body paled, cracked in jagged lines. Small black spikes grew up on her arms, her face. The eyes deepened in color, becoming an oily black with purple and red sparks.
"I serve darkness. I serve chaos. I serve hell."
Her voice had changed, anything human, feminine, ripped out of it, replaced by a distorted sound, like wind howling through caves, moving gravel, rocks, echoing off the walls.
Suddenly, her hands changed. Her left turned darker, and light seemed to flow into the palm, disappearing within. The other hand pulsed with a white light- not a good light. A sickly light, something that was somehow reminiscent of phlegm, puke, the ooze from a popped blister. She leaned down, on all fours. The dark hand drained color from the floor, making it weak, pockmarked with holes. The other hand pushed a sickly energy into the stone, making slime like fungus grow from it, turning the stone a sickly yellow, white, and green.
She howled again, and this time, it was in the altered voice, a howl of shrieking winds, of trees rattling in the night. The sound that gave children a fear of the dark.
And this time, she pounced, lunging for the twisted marine, right hand and eyes beacons of light, and her left sucking it in.
@Ookla the Heretic