Cordelia:
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As the wight takes the head, the head's lips open (its a Magic Mouth). "I've tired of my exile Ashourina. I'm free of your service."

Out of Character: Greater Plane Shift only is perfectly accurate if you've visited the desired location, if not it'd scatter as normal. A platform of jaunting may serve you better. Also, you are under continuous (completely ineffective) attack by wights and skeletons as this is happening.