Zynum Flask

From Valwiki

The Zynum Flask is an artifact of malevolent energy, crafted and initially utilized by the necromancer Reeves, resembling a thick jar with a narrow stopper that is constantly shedding shadow from its central point. The object was created to be used in conjunction with rituals of mass resurrection, wherein a competent necromancer could focus his or her energies more efficiently into amassing an army of undead. All that was required beyond this was the wealth of raw materials, i.e. the bodies of the (almost always recently) deceased. Reeves used it to great success in the reclamation of Wretholm from the armies of Drodarr Doomquake (38 PF), reanimating the thousands of soldiers slain in nearby Sslodraeth. It has since fallen out of public view.