"The Nixie that was holding the knife was immediately impaled upon Raleigh’s antlers, moments before Henry—in all his natural glory—fully removed the water spirit from the realm of the living. Her body, still skewered upon the antlers of the dryad, began to wilt, and then subsequently disintegrate into a vast pool of acrid water, as if her body were a giant sponge being wrung dry by unseen hands. Her voice carried an ear-splitting wail throughout the cavern until, in mere moments, she died."

^ Hero's last post, before Raleigh posted again. Raleigh didn't 'one-shot' the Nixie, he and Henry attacked it, then our GM decided it died... fairly quickly, at that.