Zodiac Clamation

Zodiac Clamation (天体の御猛攻撃網羅万象 (ゾディアック·クラメーション), Zodiakku Kuramēshon; lit. "Divine Onslaught of Heavenly Bodies Encompassing the Universe") is considered to be a spell of immense power, so much so that it's ranked as one of the highest of its kind. It's one of the few spells outside of the basic elements that can be used with more than one magic; in this case, it can be used with both Heavenly Body Magic and Celestial Spirit Magic — only possible due to the nature of the spell.

It's referred to as the "Ultimate Prayer of the Heavenly Bodies" (天体の極祈, Tentai no Gokuki) because the incantation used & the way spell calls upon the incredible powers hidden within the cosmos — focusing it on the stars, which is then used to fuel itself to become an unrelenting, yet serene destructive force. It's unknown when this spell was created, but it's known that it has existed for quite a long time — something attested to by the various Celestial Spirits, one of the oldest known species.

Description
"A spell that calls upon the power of the twelve heavenly guardians who protect the stars & everything within the cosmos. It's said that this technique represents their power exerted over all things — even the other constellations & heavenly bodies, while being subjugated under their Celestial Spirit King."

- A researcher explaining the contents of the spell

Incantation
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Trivia

 * This spell & some of its mechanics are based on the attack of the same name from spin-off series, Saint Seiya: The Lost Canvas.
 * According to the author, this spell has some similarities to Fairy Glitter — albeit unintentionally, mainly in power & execution.
 * It's slightly hinted that the spell has either the same amount or even more power than the Urano Metria. This is shown by the fact that it's ranked as a True Heavenly Body Magic (真・天体魔法, Shin Tentai Mahō)-level spell, all of which are known to be incredibly powerful in their own right.
 * Due to the power of this spell, it's restricted to 3-4 characters per user. No exceptions.