The Night of Wild Magic

On the 10 Vall 1360, two weeks before the start of the campaign, blast of arcane energy exploded in the heart of Albion and washed across the island kingdom like a sparkling wave of green flame. Many of the people, places, and things touched by the wave were magically transformed in seemingly random ways. Others were unaffected as the wave washed over them harmlessly. The transformations range from curious and amusing to disturbing and malevolent.

No one is sure what caused it to happen.