Writhing Spine is a miscellaneous crafting material in Diablo III. They can be combined with other demonic body parts to create a ring of incredible power.
It has an Item Level of 63 and requires a character level of 1. They be can stacked up to a maximum of 100.
"This mass of bone and nerve constantly twists and moves, grasping for muscle and sinews that are no longer there."
Acquisition[]
The Writhing Spine drops from Uber King Leoric or Maghda after using the Infernal Machine at level 60-69. It is account bound.