From HammerWiki
In ages past the human nations of the Old World buried their important dead beneath mounds of earth or stone, together with their battle gear and worldly wealth. Powerful spells were cast over them to protect their hoard, and potent enchantments were placed over the dead so that they could keep vigil over their resting place. These were heroes and mighty warriors, and they were not all good men - many were rotten-hearted lords enmeshed by evil sorcery and material greed. It is their restless corpses which still haunt the abandoned grave mounds, and it is the cold chill of their evil which causes the living to shun these places.
Wights are not raised from the dead by clumsy Necromancers toying with the Wind of Shyish. Instead, Wights rise of their own free will, serving any evil cause which lets them fight again. They wear ancient battle gear of bronze and black iron, corroded by time and dusty with the years. They carry weapons inlaid with evil runes and glistening with gold and silver. Powerful spells bind Wights to their tombs, sustaining them with dark magic so strong that it has endured for centuries. These spells can be broken by those who can control the undead, who can compel Wights to fight on their behalf.
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Warriors without peer, Wights have had centuries to hone their martial arts. Wights are corporeal undead, much like Zombies, but they are far more dangerous. Wights have lost none of their dexterity, speed, or intelligence in their rebirth.