Daemon Weapon

“For seventeen, long centuries have I remained in this blade, confined within these metal walls. During all of my time of imprisonment you are the first I have seen who is worthy to bear me into battle. Come, take my hilt, and I will serve you in the manner of my kind, drawing blood of your enemies, protecting you in the midst of the fight, bringing you safely home again. Now, draw me from the scabbard and test the fineness of my balance. See how easily I swing, how my keen edge cleaves the air. A good choice, am I not? Willingly you picked me up. Your first mistake. Willingly you drew me. Your second mistake. I do not allow my servants to make three mistakes, foolish mortal...”

—Antinichus, Daemon of the Bloody Blade

Of all the arms and artefacts made available to the Champions of Chaos, none are so vile, so terrible, as the Daemon Weapon. Each rune-carved blade is a servant of the Dark Powers in its own right, since bound to it is the foul spirit of a Daemon. The weapon serves only the interests of its Chaos God, reaping souls for the glory of its master.

Daemon Weapons are forged at the very heart of the Chaos Wastes, where the Chaos Void and the Wastes wash against each other. Here, in the heatless fire of the Void, the blades are smelted by the Gods’ mad servants, forged on the soul-anvil of a living servant, tempered in the screams of the doomed, and quenched in innocence. But before it is complete, Daemons inscribe the blade with dread runes, and ready the spirit of the Daemon chosen to inhabit it. Such acts are insane, and all the Shadowlands resound with its wailing. Once installed, the weapon gains a life of its own, and it is carried forth into the Wastes where it’s presented to its wielder as a symbol of immortal approval and power.

These infernal blades are granted only to the most favoured of Chaos Champions or borne by Greater Daemons and Daemon Princes. Such a Reward is great indeed and offers its wielder incredible power.

Daemon Weapons are similar in function to Chaos Weapons but are generally rarer and more powerful. Unlike Chaos Weapons, whose power rests in the magic bound within them, Daemon Weapons are in fact vessels, containing the essence of the foul fiend bound within. The weapon gains properties and functions depending on the Daemon inside.

Source

 * Warhammer Fantasy RPG 2nd ED -- Tome of Corruption -- pg. 191