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"How bad will it be?"
"This is the event you're worried about. Circumstances on the Convergence will be exceptionally favorable, which in this case is not a good thing. Because it falls in a surge window. Castings will be exponentially magnified. Enchantments will malfunction. Death toll in the millions, maybe higher."
Penny Adiyodi and Daniella Marcus[src]

The Harmonic Convergence is a rare and powerful astrological occurrence in which a cosmic sigil is formed by Earth and several other planets, amplifying all of magic exponentially for several minutes.

History[]

The Harmonic Convergence has occurred four times before on Earth, causing the extinction of the dinosaurs, the destruction of Pompeii, the sinking of Atlantis, and the invention of Auto-Tune.[1]

The 2020 Surge[]

Harmonic Convergence TM

Harmonic Convergence

As Julia Wicker was trying to find a way to predict the surges happening on Earth, she seemed Daniella Marcus who created a statistical prediction chart that showed that a fifth harmonic convergence was supposed to happen in 2020, as a large magical surge. Combined together, it was a scenario for magic spell creating an apocalypse. [2]

"When all the spells cast by all the Magicians go haywire, you're gonna get earthquakes, starvation, plague... And then come cannibalism"
Clarion[src]

Zelda Schiff will then explain that the convergence is a specific sigil created by the position of certain constellations, moving one of them would break the sigil, rendering it useless. [3] This is how Julia and the gang will start to find a way to move the moon, as it is the closest and easiest constellation to move. This plan will go haywire and break the moon [3] but after several time loops, they would succeed to move it without causing her to break. [4] The fifth Harmonic Convergence was then avoided.

References[]