Taranis' Wheel

Origin
Taranis is the Celtic god of thunder, previously worshipped in the British Isles, Iberian Peninsula and the Rhineland. Although recorded by the Roman poet Lucan, many of his attributes were likely picked up from other gods, such as Jupiter and Odin. He has been commonly associated with the chariot wheel, representative of sun worship usually held by the pantheon’s leader. The Celtics in particular followed a wheel of the year, a calendar that divided the seasons into a circle of festivals centered on the equinoxes, solstices and seasonal midpoints.

Effects
When spun or held, it causes the current month to change to another. The weather, clothing and even celebrations will all change to match the new month. The effect is naturally expansive, meaning the area affected will continually grow larger starting from wherever the person travels to. The activator will gradually feel their body turn into sunlight until they are fully converted, after which they dissipate into the surroundings.