No one knows where the system came from or who created it, it just suddenly appeared. Along with it came a huge amount of MP(magic powers) of 100, which was the highest an average human could hold, those who couldn't contain turned into crazed beings which were later called berserkers, they still had consciousness but they had fallen into the depravity of killing, whatever that moved, they killed. Humans level up through killing beasts which were once normal animals, to killing others or berserkers, or by maxing out their experience points which they gain from doing the above.

As the System appeared so also did other racial species  appeared,

Goblins

Elves

Beastmen

Werewolves

Vampires

Demons

Celestials

Asuras

Giants

Minotaurs, etc.

Some came just to explore while others came to oppress and take some slaves back to their home planet.The World Path System provides a path that benefits a particular individual, and that path determines what you become.

There are several paths and I'll mention a few.

King's Path

Battlemage Path

Wizard Path

Sword Path

Fist Path, etc.

So whichever path an individual chooses, the system would provide him/her a guide to walk through it.

Every being, beasts, race are classified into Orders between A to F, starting from F up to A, and past A is the S order, and after the S order is the Void order. Each order are made up of at least 50 levels. Once a person dies or is killed, he /she drops a loot box, that contains all his skills and equipments, so the system is just like a game.

Equipments are classified into the following:

Common grade

Uncommon grade

Rare grade

Ultra Rare(U-R) grade

Epic grade.

Skills can be categorized into orders, but this time in cardinals, i.e from 1st to tenth orders.

Common features in the World System Status page:

Name

Age

Race

Level

Path

EXP

MP

Strength

Agility

Speed

Intelligence

Constitution

Vitality

Skills

Equipments

Inventory