(IMPORTANT! This document contains mild spoilers from the book. The main character learns about many of these things throughout the story. However, nothing included here will spoil the experience. This guide serves to help the reader remember details if necessary.)
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*Spiritual Guardians*
A Spiritual Guardian's power is tightly tied to their soul. Their basic powers come from the Spiritual Root, the Rings, and the Blessings.
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*Spiritual Root*
After awakening, the individual is nurtured by the universe's laws, which create a Spiritual Root inside their soul. That root becomes complete once it receives the primordial Bloodline of a Mannaz. Its main function is to connect the person to the world's laws, letting them use blessings to alter reality.
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*Blessings*
These are unique abilities, which can be simple or complex. A blessing lets a Spiritual Guardian twist reality in some way. Once created or learned, a blessing can evolve and gain new properties as the individual's power grows.
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*Rings*
They are cores that store and generate a energy. Each person has between one and nine rings, and the power stored in them can be used for many simpler actions like boosting vision or floating. They're also essential for using blessings or spiritual techniques.
Once someone becomes a Spiritual Guardian and returns to their real body in their universe for the first time, the ring's power nourishes the body, making the person stronger. All races live for hundreds of years, have regeneration and heightened physical ability, and no longer need to eat or sleep daily.
The energy of each ring has a specific color. As new rings are created, the energy grows denser and stronger, opening new possibilities.
* 1 - Red
* 2 - Orange
* 3 - Yellow
* 4 - Green
* 5 - Blue
* 6 - Indigo
* 7 - Violet
* 8 - White
* 9 - Gold
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*Martial Arts:* Techniques used specifically by Mannaz Summoners. They combine Bloodline power with the ring power of a partner. Ranked from D up to S based on raw strength.
*Spiritual Techniques:* Simple abilities created by Spiritual Guardians, using ring power to boost their own capabilities (like a "buff"). Only those with exceptional skill in manipulating ring power can create them, but any Guardian can learn them.
*Magic Techniques:* Knowledge or arts from other universes. The energy used to make them is different from ring energy, so a Spiritual Guardian has to adapt and modify those techniques before being able to use them.
Note: The exclusive techniques of the Empires of Earth are Magic Techniques.
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**Classes**
Spiritual Guardians need to form groups to complete missions in other universes. To make things easier, they're split into classes, based on the blessings chosen by each individual.
*Support:* Focused on helping allies, whether by healing them, changing the battlefield environment, or affecting enemies without dealing direct damage.
*Fighter:* Focused on dealing melee damage. They're effective at taking out targets alone, as long as they can get close without being noticed.
*Mage:* Focused on dealing long-range damage. With allies to protect them, they can take down nearly any enemy with ease.
*Tank:* Focused on staying on the frontlines, absorbing enemy damage or blocking them from attacking allies.
*Mystic:* A rare, versatile class. They can perform multiple roles from the other classes, adapting to any situation. They're not top-tier in any one thing, but their adaptability makes them essential in tough battles.
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*Power Levels:* After reaching nine rings, a Spiritual Guardian can go beyond and become immortal, if they manage to meet certain requirements.
After this evolution, everyone enters an unstable, weakened power state. To stabilize, they must do something terrible and dark.
Those who succeed become a *Spiritual Sovereign*, while those who refuse, remain unstable and are called *Immortal Keepers*.
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*Universes:* There are countless universes, each existing within a closed-off region separated from the others, making travel between them almost impossible. Each one has its own power level, ranging from a dead universe (like Earth's) to others on the complete opposite end, full of races and mystical powers.
*Laws of the Universe:* Every universe has its own unique laws, applying to everything within it. Some universes can have very different rules, but no rule can go against the World Laws.
*World Laws:* The ultimate rules that govern all universes and life forms. For example: the Law of Karma, to which all races are bound.
*Heaven's Will:* A consciousness working together with the World Laws, responsible for keeping order between universes and caring for all life.
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**Devil and Celestial World**
*Yin Realms*
*1 - Devil
*2 - Dark Saint
*3 - Devil King
*4 - True Devil Lord
*Yang Realms*
*1 - Radiant Sage
*2 - Holy Saint
*3 - Radiant King
*4 - True Holy Imperator