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Henzell says...
  1. A completely irresistable hex from demonspawn {warmonger}s. Inflicts 20 to 30 turns of Sap, which makes casting any spells prevent you from casting any other spells for 3 to 5 turns (including past the duration of Sap itself).
  2. Prior to 0.28, was a fixed-70%-chance line-of-fire hex still from {warmonger}s. While affected, casting a spell had a 50% chance to apply a spellcasting success penalty, stacking up to 3 levels.

Information based on master branch and the great LearnDB.
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