Now that the haunt has been laid to rest, Hargrimm fishes a wand out of his pack and approaches Wren.

"I'm hoping this will have you sturdy as stone Mr. Elbourne. Let me know if you feel any improvement."

Spoiler
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Use the wand to cast Lesser Restoration on Wren. If he shows improvement, but still shows signs of weakness, Hargrimm will spend a second charge.