Emissary:

(Emissary of God) A person capable of using the energy of the world and transforming it into its capacity. An emissary can be a fighter or not, the status of an emissary depends on its nature: finger, hand, or avatar (of God).

Branch:

Category of powers to which a person belongs (Healer, Hero, Warrior…), each branch determines the type of power of the emissary. The fingers have no branch.

Class:

The different levels of power found in a branch (thief>assassin>shadow>reaper), their number differs according to the class.

Evolution:

When he reaches a certain skill level, a fighter can see his level increase and his class change (magician>mage>…).To evolve, an Emissary must accumulate statistics via magical stones) and/or obtain special skills, except in the case of the Avatar which never evolves.

Skill:

Skills acquired by an emissary according to his class. A skill can be found person-to-person or exclusive, depending on its rarity. By nature, a skill is only accessible according to its class, except in the case of the avatar who can occasionally use advanced skills of its branch.

Finger:

A person who is able to use only one of the powers of the world, elemental or physical.

Hand:

A person who is able to use the advanced abilities of only one branch of powers (healer>cleric>Priest>saint) Hero is the only branch that has attributes of other branches but is not an Avatar type.

Avatar:

A Person capable of using several types of power from different branches regardless of their necessity (physical powers of a berserk + magical power of the wizard branch + etc.) It has no class but since its abilities group several branches, it requires more effort to increase its power. Ironically, the more branches he had, the weaker it would be.

Magic stones:

When a creature capable of using the energy of the world dies, its energy takes the form of a stone whose powers vary according to the branch of the user, Assimilating the energy of this stone makes it possible to increase strongly the user's ability or add new skills, but a user cannot assimilate the energy of a stone that is not compatible with them (a berzerk cannot assimilate a stone from the healing branch.)

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Elemental stones:

Assimilating the stone that appears randomly or from an inorganic energy source allows you to quickly increase a basic energy category (mana, stamina, speed, attack, magic, etc...)

Soul stone:

A stone that appears when a creature capable of using the energy of the world dies, it grants those who assimilate it powers belonging to its branch. When the assimilator is from the same branch as the energy of the creature, the stone is compatible and can be assimilated, if they are from different branches, assimilation will be impossible, the stone is incompatible.

Rare stone :

A special type of magic stone, which can be assimilated by any branch. It grants different types of abilities, not necessarily combat (sewing, cooking, understanding languages, weight, alchemy…) Their origin is unknown.

Rank:

The system used to measure the level of a human being or creature using the energy of the world, the lowest rank being E and the highest SS

Rift:

Manifestation in the form of a mass of energy. Its interior is extremely varied (a cave, a beach, a castle...) Nobody knows their origin nor the nature of the worlds to which they give access. A rift lasts for 5 days by releasing more and more energy, on the 5th day, the rift opens completely and the monsters enter the world.

Disaster:

Creatures living in rifts. They can have various appearances and capacities. Their ranking is from the rank below E (Threat) to SS (Doom).

Mallus:

Each emissary has a "system" which defines its attributes. Avatars are the only ones with mallus in their system, so for high attack strength, an avatar may end up with the inability to use magic power. A mallu can be weakened by an elemental stone

Setting:

The story takes place in a universe similar to ours, there were kingdoms and empires but also countries with modern technologies such as the internet or rockets. In this world, some people have powers of all kinds that they use to confront creatures originating from rifts, in a traditional RPG style, the protagonist,

Guild:

Organization of Emissaries bringing together fighters of various ranks.

Spoilers ahead, this part is mainly for advertising, for those who are not happy with the progress of the current book, if you like it I suggest you again not read this.

System:

An entity belonging to a rare person called "Sin Avatar", and guiding them on a path to follow depending on the type of system possessed. There are 7 different types representing the sins and offer different content to its user depending on the sin, for example, Sloth Avatar's system can power other people while Greed only powers itself.

Sin Avatars:

Also called True Avatars, are people gifted with the power of a system. There are only 7 of them, each with a different system depending on the sin they represent.

Players:

Special entities from an unknown origin. They have a system "complementary" to that of the Sin Avatars and need to fuse it with one of the Sin Avatars to fully activate it.

Origin Beasts:

Mythological monsters, from legends, are believed to be at the origin of the world. No one knows if they are Disasters.

Soul Stone:

As explained in the first sheet, it is formed when a creature using the energy of this world dies, it generally gives attributes related to the skills of the owner, and the stronger the skills of the owner, the more abilities there will be available and the strongest skill will always be among them.

Author advice:

Not a spoiler but pay attention to the story's POV.