Altar of Darkness (Warcraft III)

This structure serves as a channeling nexus for the Scourge's dark restorative powers. When a hero falls in battle, his essence may be recalled to this site, where it is given new, unholy life. Provided that the building stands and resources are sufficient, undead heroes will not stay dead for long.

In World of Warcraft, the Undercity's War Quarter has an Altar of Darkness in it. It looks the same as the Tower of the Damned, which may be one itself.

Heroes
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