Holy Magic

Holy Magic (神聖魔法): Holy magic is, in essence, magic that manipulates holy energy and purifies magicules via the power of the "Faith" of the user, and at the highest level, magic that incorporates holy energy with spiritrons to perform powerful magic called "Divine Miracles".

Principles
Holy Magic can broadly be split into two categories, The power of "Faith" which allows the user to manipulate Holy Energy generated by belief/the strength of their will, to purify magicules and heal injuries, And the power of "Miracles" which involves the user manipulating "Spiritrons" the building block of magical energy. While any being of sufficient belief in their "God" can utilize the former, only the most advanced and devout users can truly master holy magic and obtain the ability to use "Miracles".

While the being or God used to cast the Divine Miracle is "Divine" they are not necessarily "Holy" as evidenced by both Rimuru and Luminous Valentine.

Usage
Holy magic is most commonly used for healing injuries. Higher level practitioners can even regenerate lost limbs or resurrect someone from death. Beside healing, holy magic can also be used for offensive purposes. There are two ways to attack with holy magic — conjuring energy with holy attribute that purifies magicules (almost harmless against humans, but deadly against monsters), or directly weaponizing spiritrons via the divine miracle.

Known holy magic includes:
 * Divine Miracle: Disintegration | In a process similar to nuclear decay spiritrons bombard the target and destroy all physical to spiritual components of the target.
 * Divine Miracle: Ressurection | By utilizing spiritrons the user is able to heal any wound and even bring back the recently deceased.
 * Divine Miracle: Holy Ray | A beam or ray of spiritrons shoots out from the user, bypassing all barriers and piercing the target. Less powerful than Disintegration but much easier to cast.
 * Holy Cannon | A focused beam of holy energy that rapidly purifies the magicules of a target. While a holy being or a being without magicules would simply be pushed by the shockwave it's a surefire technique for killing monsters.
 * Holy Bell | A wide range wave of holy energy surges from the user, purifying a large amount of magicules, destroying any lesser monsters, and releases the grudges of the dead.
 * Holy Field | Usually maintained by several magicians working in tandem, within the radius of the barrier purification of all magicules commences. Lesser monsters are killed instantly and any higher magical being is severely weakened. The barrier is even capable of preventing the use of regular magic and sealing the use of most skills.
 * Prison Field | A much weaker version of Holy Field that weakens all monsters over a vast area and prevents escape.
 * Heal/Recovery | By utilizing holy energy wounds and diseases can be cured instantly and at higher levels even entire limbs and organs can be regenerated (although it cannot restore lost blood).

Trivia

 * Although holy magic is considered it's own type of magic, it's strictly speaking; a sub-set of Spiritual Magic.
 * Since holy magic is usually associated with the Western Holy Church and monster slaying, it is widely believed in-universe that monsters are not capable of using holy magic. Therefore, most characters react in shock when they see a monster casting it.
 * In Luminism being able to use "Miracles" is required to advance to the rank of Bishop.