两个客户端完全一致：无限没有改动这件物品。
经典怀旧服 1.15.9.69722
两个客户端一致，列表数据里没有保存它的提示框。无限测试版 1.60.1.69913
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Use: Empowers Kel'Thuzad and his lieutenants with necromantic energy, granting them increased health and damage. Empowered foes will yield additional rewards upon defeat. This effect stacks and lasts for an entire week.