In the Age Of Sorcery all monsters have a certain classification.
1. Pests : big rats and other giant insects and rodents.
2. Common Monster : Bears, wolves etc.
3. Elemental monsters : fire chicken, water bird etc.
5. Horrors : sprite type monsters like banshees.
6. Giant: Any creature that is more than 10 meters tall.
7. Kaiju : Ginourmous creatures that are more than 100 meters big.
8. Legendary beast : A type of species or a creature that has gained immense power
Pests are the weakest type of monsters. After them is common monsters. After them is elemental monsters. And this gies on until number 6.
All kaijus are legendary monsters. But not all legendary monsters are kaijus. Some are are giants. Some are normal sized.
For example dragons. Dragons are a legendary species. But all of them are not on the same power level.
A dragon usually is 10 to 20 meters tall.
Also there are some elemental type monsters on legendary level.
All creatures above common monster have a chance to be an elemental monster.