Mana is an ethereal 'essence' which appeared in the late 2010s. People who became able to wield it were called the Chosen. The Chosen wield it in 2 primary ways, which classifies the Chosen as Conjurers or Augmentors.
There exist 6 realms of power on Earth.
Conjurers:
Realm 1/ Rank 1: Apprentice
Realm 2/ Rank 2: Adept Mage
Rank 3: True Mage
Rank 4: Arch Mage
Rank 5: Sorcerer
Rank 6: Warlock
Augmentors:
Rank 1: Novice
Rank 2: Advanced
Rank 3: Master
Rank 4: Grandmaster
Rank 5: Marshall
Rank 6: Warlord
As time went by, various animals became able to wield this energy, whilst some were unable to control it and went mad. Either way, they are classified as Mystical monsters within 6 ranks and 5 classes.
Monsters:
Rank 1: Rogue (eg, Rogue Beast)
Rank 2: Awakened (eg, Awakened Demon)
Rank 3: Abyssal (eg, Abyssal Fiend)
Rank 4: Arch (eg, Arch Beast)
Rank 5: Ancestral (eg, Ancestral Tyrant/ Ancestral Sovereign)
Rank 6: King (eg, King of the Titan class)
[A/N: King Titan doesn't sound good]
Classes of Monsters:
Beast
Demon
Fiend
Tyrant/ Sovereign
Titan
The monsters are classified in these classes depending on their shape or form; their special abilities or inherent aspects they are born with or obtain.
Additionally, there exist objects like Artefacts and Relics which store magical powers and so on.