Just the general knowledge of things more will be added in the story or another auxilary chapter in the future with spoilers warning
General Realms:
-Mortal
-Inhuman
-Master
-Grandmaster
-Saint
-Immortal (Lord --> King --> Emperor)
-Demigod
-God (Lesser --> True --> Primordial)
Every realms is divided by early, middle, late, peak
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Monster Type:
-Inferior
-Elite
-Rare
-Lord
-High Lord
-Legendary
-Mythical
-Ancient
Monster type isn't the realms of monsters, it's how the growth of the monster'
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Weapon/Items and Class:
-Common
-Uncommon
-Rare
-Unique
-Legendary
-Mythical
-Semi Divine
-Divine