Celestial / Cosmic
Planar Shift of the farming community Wamper's Feast. While seemingly insignificant at the time, later studies reveal the successful Shifting of the entire community without loss of life, property, or memory proved the success of the Shadowfae experiments with the Veil. Five years later, the same ritual will be used to open Arborea to the Shadowfell, inviting complete destruction. (But they didn't think who they invite in though, eh! Score one from Wamper's, that little business of the Great Betrayal aside.)