It's a small sphere of energy, created and generated by words and human thoughts and ideas and emotions. The reason no one has ever seen one is because it takes on the shape of their thoughts, becoming reality. It's basically their imagination in a physical form. It's extremely powerful. The smallest word or thought or feeling can change it's appearance and it's power drastically. It embodies the good and bad of human nature.

Xuris approached the heavy wooden door. It was inlaid with precious and semiprecious stones of every variety imaginable; a closer look revealed than no two had exactly the same color or crystal structure. His Siblings stood, black-robed and silent, in a semicircle around him. Xuris knew that any attempt to shirk or falter would set them upon him, vying to take his place and cast him aside like so much worthless garbage, but his hand still hesitated an inch above the golden plate set into one side of the door that served as a handle. Then he was touching the metal.

A slight chill came over Xuris as soon as his fingers came in contact with the gold. He whispered the phrase every Brother or Sister knew by heart, and, noiselessly, the door swung open. There was no movement from the onlookers, but Xuris shivered as the temperature of the room suddenly dropped. The thing in the closet beyond, the thing of so much Power as to be nearly unimaginable, floated in stasis: the Negator's Spear.

The Spear was not so much a spear as a wizard's staff, its lower end sharpened to a cruel point. The upper end was capped with a magnificent, perfectly spherical diamond, faintly luminous, held within a stasis globe that hummed with Power. A claw setting, that looked like it was made from shadow, attached the globe to the jet-black haft of the perfectly straight Spear. Xuris risked a glance back at the semicircle of watchers, and saw them looking down, as protocol of the Siblings of the Spear dictated. He shivered again as he remembered the verse from Sibling scripture: Thou shalt not gaze upon the Spear until thou art the ill-fated Negator and go to die by the Spear's awesome Power. And it was true: if all went well, Xuris would meet his demise tonight.

Xuris heard the chant begin behind him, low and discordant, waxing slowly in volume as it went on. A breath of hot wind blew through the underground chamber, bringing with it the smells of smoke and decay and other things, things best left unmentioned. He began to feel unnaturally joyful, giddy to the point of insanity. He wanted to do this. This was the right path, the right death, in service to the Spear. Xuris suddenly lunged forward, grabbing the Spear out of its stasis field. Hood off, eyes crazed, Spear held high, Xuris turned around, to see nobody in the room. He could hear the chant still, filling his mind with his task, but the other Siblings had assumed spirit form. Spirits did not see things, they only perceived energies, so they could recognize the Spear while not "gazing upon" its earthly form.

Xuris took off at a sprint, up the narrow flight of stairs to the abandoned fisherman's house where the Abode of the Spear had chosen to show itself. Tonight's target would obviously be Water; there was water everywhere, from the driving rain to the waves pummeling the pebbly beach. The Spear seemed magnetized to its destination, almost pulling Xuris toward the surf instead of the other way around. He heard the spirit-chant stop abruptly, replaced by mind-whispers of Here. But Xuris needed no instruction: aggravated by the presence of the Spear, the Water energy line was already glowing a deep teal, ramrod straight along the coast.

Xuris had almost taken leave of his senses. If not for the Spear's commanding aura and his Siblings' guidance, he would be an utter madman, gibbering nonsense at the rain-lashed sky. He could feel his life force being sapped to fuel his mad energy, his limbs weakening and flesh acquiring a sickly, cinereal tinge, but his task was not yet over. With a wild cry of reckless abandon, Xuris raised the Spear above his head and plunged it deep into the Water line.

For a moment, time seemed to stand still. Everything in the world was centered on those two objects, the Spear and the line. They were fighting a desperate battle, but the Spear won, as it always did and was enchanted to do. A sound like a thousand dying dolphins permeated the scene, mingling with Xuris' tormented screech. The blue light of the Water line was sucked into the sphere like water down a drain. The diamond that capped the Spear glowed dazzlingly bright for a moment, throwing Xuris' face into stark relief. It was thin, almost skeletal, gray skin hanging off the bones in a truly grotesque manner. He looked a century older at least. And then the light died to its previous dimness (though perhaps a little brighter than before), and Xuris collapsed to the ground, clearly dead. The Spear remained hanging in the air for a second or two, but then faded into the night. The remaining Siblings rematerialized and scattered, leaving Xuris' emaciated body where it lay. The Abode of the Spear would appear again in a month or two, but until then, the Siblings of the Spear would lie low. Anyone who took energy lines' power for the good of a sinister object would be mistrusted...or worse.     

It is a pen. This pen is enchanted so that the person wo writes with it is enchanted, or something.

Wow! These are three good ideas! I'm always amazed at what you all are coming up with. It's also a joy to know that so many of you are good readers -- it's apparent from your writing. Please keep the concepts coming!

It is pure evil, darkness, dread, pain, the few who have seen it call it "Oblivion".

Our villain has one drop of it when inflicted it does not kill that person untill the master of it commands it to do so. Instead it turns that person dark, it brings them to the brink of death.

It is the thing people fear the most, because they do not know it exists. 

S/He keeps a single splinter of wood. It was long forgotten, and to this day it is said that only one person knows of it, and s/he has lost most of both mind and memory.

The splinter is great in power and is rumored to corrupt the person who gets pricked by it. The splinter has a great history of the past, present, and future.

The villain keeps a map of all the world. It may not sound like much, but that's because I've understated. It is more a map of the... realm? What do you humans call it? It's wherever you can fly without magic... containing all of space. The Universe! That's what it's called. This is a map of the entire realm/universe. I don't know how it all fits on one map. I guess it's a magic map.

These are superb ideas! I like your thinking!

The eloquently carved box, tucked away safely in the closet, began to stir. It thumped and banged in protest, as the thing inside began its fight to break free. Inside the box, lay a small dove. The dove fought the box of evil with all its might, for the dove wanted to drink the air of freedom. The dove however, was to remain trapped forever, for it held the villain's most desperate secret... someone always craves beauty and innocence, even a witch.

Lycan occasionally visited the old building, though he didn't live there. He knew he could track Fable down. He would consume her and restore his eye. His eye, which had been destroyed by her father, who smelled of starlight. He had a bit of an obsession with his Rekcart, but it showed him a view of Fable if he could convince it .........it had a mind of its own........

In the closet, there is a  tiny key in a blue velvet box that says Intiquere. The key is tarnished silver, and looks far too old to be of use to anyone. The key has a large amber jewel set in it which seems to gleam even in the darkness of the closet.

I really like the key idea, but I'm just blanking on what it opens. Please comment on this if you have any ideas. Thanks! 

It's a vial. Just a small vial of something that s/he has forgoten about. When her mother died she gave it to he/himr. It is a small vial of her mother's love. Her mother saw that they would stray from good, so she knew when the right time came it would help guide them to good again.

The villian keeps a vial in this closet. Inside of it are the secrets of everyone in the realm. The deepest, darkest, most terrible secrets people bury deep in the back of their minds. All s/he has to do is uncork it, and everyone in the world will know eachother secrets. It will cause anger, mayhem, and violence, and that is exactly what this villian wants.