The Chained God, scavenger of dead worlds and ancient civilizations, was hunched over a lump of black clay, over a condensed piece of shadow. Two hands, bound by the chains of some long lost jail, formed the umbral material into the shape of a man. The figure was long and spindly, as if it had been stretched out of proportion. More arms were added to the thing, and the figure grew in size till it was almost twelve feet tall. The Voidwalker spun threads of the ethereal divine energies, and infused the thing with life. A face, half formed, appeared on the being's face. Some of the darkness faded from where the thing's head and hands would be, leaving a strange pattern, almost as if the thing was wearing robes of darkest night. Its varied spearlike legs and arms could pierce even the strongest metals, and its flesh was unseeable by divine eyes, save for the Voidwalker itself. Speed and grace were endowed upon the thing, and it stood at attention.
Still, it held no... soul, no vestiges of thought and of the malice needed. It was but a tool, one that the Watcher in Darkness needed to give a mind. The Voidwalker, knowing of one such being, sifted through the chain links of its body, and pulled a single lock of hair twined around a particularly newer link.
As the god's fingers traced the hair, it remembered to whom it had belonged to; A young woman, graceful and beautiful, one who had many suitors. One such suitor had bargained with the Emperor in Chains, begging for her love. And so, the Chained God gave the young man the love of his desired, at the cost of the man never seeing her again. He went mad, raged against the world and the gods, slaying thousands. His soul had been taken as soon as the man had been slain, by the woman who loved him most, in a cruel twist of irony.
The soul, bound to the very body of the deity, wafted from the lock of hair, which promptly crumbled into dust. a black wisp of shadow drifted to the monstrous body. Suddenly, the idle monster roared into action, its multiple arms twitching with rage. It jumped to and fro, slashing the blasted rocks and stone pillars, and rushed at the god of the void. A single twitch of a finger encapsulated the thing with ethereal chains made of ether.
You are the Reaver. You are my sword, my dagger in the dark. Go, and wreak havoc and death. The thing, its mouth salivating, leapt from Ss'Vadgrin, and into the dark voids of space.
The Reaver, a thing made of shadow and of the soul of a crazed murderer, is born. It can travel in between worlds, using the shadows to teleport. It lives to cause death and inspire fear in sentient beings, but does not kill too many in one place, a single family at the most. It cannot be seen by divine eyes, and for all purposes, cannot be killed by mortal means. It draws power from the fear it inspires, and disposes of its victims by impaling their eviscerated corpses on trees, or leaving them in the forest. It begins by attacking a remote village on Aether.