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Ineluctable Echo [Spelltouched] Edit
Those who use words of power around you hear the sound of their own voices.
Exposure to wail of the banshee or any power word spell.
When you are targeted by a power word spell, whoever speaks the power word is also affected by it (as if he had cast it on himself). Likewise, when you're within the area of a wail of the banshee spell, the caster of the spell also hears the wail and must succeed on a Fortitude save (using his own save DC) or die.
Possessing the Ineluctable Echo feat doesn't protect you against power word or wail of the banshee spells. You experience their effects normally.