Spire of woe
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Spires of woe are a type of defense tower built by the Burning Legion. They were used during the Illidari assault on Mardum, the Shattered Abyss, and again a decade later at the Battle for the Broken Shore.
While at the Broken Shore, they were associated to crystals which anchored the structures to Azeroth. When the crystals were destroyed, the whole structures crumbled. Destroying the crystals associated to the spires in Mardum instead just disabled the structures.