There are different levels of monsters in the world, and there is an easy way to identify them without studying.
Monsters are split into four categories: Low-level monsters, mid-level monsters, high-level monsters, and specially ranked monsters.
Each level is separated and determined by the color of their mana stone and also their overall magic stats in combat.
Monsters with green magic stones were usually classified under the low-level categories. They were known to be smaller and barely capable of harming anyone, at least not in a threatening way. An example would be a water slime or a firefly.
The color changes as the monster's level increases: orange for mid-level and red for high-level, and it was quite easy to spot the difference, especially since research had gone into adventurers knowing which monsters to engage with during a quest.
That said, the special-level monsters were an entire breed of their own.
