Vergence
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A Vergence is a proposed event under the cosmological understandings of the Way of the Elements and Ars Magica schools of arcane thought which results as a nature of the relative motion of the planes. When the eight essential planes (and possibly the abstractive planes) come into a relative alignment with each other, the result is said to be the creation of a Prime Material Plane, such as Ahren.
The fundamental disagreement between the two schools is the number and frequency of Vergences. Ars Magica proposes only a single vergence, responsible for the creation of Ahren and the end of the Void Age of the Great Wheel. The southern school instead emphasize the vergence as a recurring event in cosmological time.