Disintegration

"Let me provide you a prayer to the divine. I hope and desire for the power of the holy spirits. Listen to my appeal and overcome all in your way! Disintegration!!"

- Hinata

Disintegration (霊子崩壊) is the strongest offensive magic among the Holy Magic system.

Invocation
Tracing complex shapes with ones outstretched hands, the user has to craft a geometrical design in the air, stretching it out into a layered, physically present magic circle. Following that a chant gets used after which the magic is cast.

Effect
Disintegration is an attack that causes spiritron decay within the target. Anything within the area of effect gets erased, not even souls can avoid annihilation.

Countermeasures and Weaknesses
While it can destroy anything within it's area of effect, Disintegration has a limited range, hence it might have much less effects against targets with considerably large size like True Dragons or Charybdis. Also those who have analyzed and comprehended the processes that Disintegration magic is made of, might be able to create a barrier that can block the magic.

Variants
Any attack that causes spiritron decay within the target can, in principle, be considered Disintegration. Some powerful characters in series have created different variants of it.

Trinity Disintegration (三重霊子崩壊)
The most powerful attack unleashed by the Clerics of the Seven Luminaries, basically Disintegration casted three-fold. By preparing the ritual beforehand, this spell could be casted in tandem with Trinity Break.

Multi-Stage Disintegration (多段式霊子崩壊)
Diablo's take on disintegration. During combat Diablo will surround the target in invisible magic circles then activate all of them at once with a snap of his fingers, leaving the target surrounded on all sides by seven disintegrations that can be fired at will.

Melt Slash (崩魔霊子斬)
Hinatas most powerful technique. By imbuing the power of Disintegration into her Moonlight rapier, she could unleash an attack that combined both holy magic and her swordsmanship. It's powerful enough to hurt the almighty Veldora, albeit just a little.

Melt Strike (崩魔霊子突)
Imbuing the spiritrons from Disintegration into his sword, Granbell could launch it like a sword-beam. It is a level above Hinata's Melt Slash, both in power and range.

Trivia

 * Despite being the most powerful offensive holy magic, there are no characters in both the WN and LN killed by this spell as of yet.
 * On some level Disintegration seems to function similarly to Nuclear Disintegration/Decay or Gamma Radiation, real world physics phenomenon.
 * In That Time I Got Reincarnated as a Slime: Isekai Memories, the "Hinata Sakaguchi [Captain of the Holy Knights]" unit uses this as a Secret Skill.