Kill them all!
Henzell says...
  1. Drains 20% of MP and deals 4-8 damage, or double that if at low MP. Smite-targeted, evil according to TSO.
  2. Originally "brain feed," which attempted to drain your intelligence by 1d3 points, succeeding 1/3 times.

Information based on master branch and the great LearnDB.
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