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Henzell says...

1. Demonspawn mutation gained at level 2 of the hex enhancer facet. Gives melee attacks that deal damage a 1/5 chance of applying antimagic, weakness or draining to the target.
2. Also was a monster spell in 0.31-, from {black sun}s and {murray}. The caster and all allies in LOS begin "absorbing vital energies", and any melee damage they deal will also irresistably drain mp, max HP, or apply Weak. Didn't scale well enough versus extended character defenses, so it was reeplaced with {sign of ruin} in 0.32.

Information based on master branch and the great LearnDB.
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