Weapon: Maw of the Damned
An ancient Legion axe forged from a metal that drains its victims' vital energies. The soul of its original creator is trapped within and cursed with unending hunger. For more than a thousand years, an old and cunning mo'arg has used the axe to butcher uprisings and consume the life force of the Legion's foes. Over its long and infamous history, the weapon has made its demonic bearer extraordinarily powerful.
Weapon: Icebringer and Frostreaper (Blades of the Fallen Prince)
Crafted by the Burning Legion to corrupt the world of Azeroth, the soul-stealing runeblade Frostmourne was shattered by Ashbringer atop Icecrown Citadel. Countless souls were freed from the broken blade, but others were not so fortunate. Today the shards of Frostmourne can be recrafted and infused with even more power. However, the spirits still trapped within must first be subdued and bent to the wielder's will.
Vampiric demons known as nathrezim forged this ancient sword, which brings with it violence, plagues, and death. Apocalypse soon earned a horrific reputation in the hands of a Tirisgarde mage who couldn't control its destructive energies. In time the sword was seized by the malevolent Dark Riders: servants of Medivh, the corrupted Guardian of Tirisfal. They hid the blade in the catacombs under his home, the tower of Karazhan.