Epic Drow Priestesses (and their arcane counterparts the Drow Wizards) love using negative energy spells. Inflicts, Necrotic Ray, etc.
Which is a pretty sensible move when not facing Pale Masters, but they keep healing my PM in there.
Any chance mobs can be taught to use Heal/DP (divines) or Sunburst/Searing Light (arcanes) in those situations instead?