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Because Furies die very quickly due to their low hit points and the fact that enemies always try to attack them. You can't take Furies with you when clearing many neutral creatures, and the neutral creatures that can be fought with the help of Furies are, in most cases, defeated without any serious problems and without using Furies. All of this makes Iranne a questionable choice; what's the point of her special ability if you can't use warriors for that ability when clearing neutral creatures?