Four Great Dragons

The Four Great Dragons (四大竜) are a group of four Mega-level Dragon Digimon that are derived from the Chinese myth of the s who rule over the four seas surrounding, and manifest as its four great rivers. The Dragon Kings appeared prominently in the epics  and.

It is said that Slayerdramon's form is one that can only be attained by those who complete the training that is called the "Trial of the Four Great Dragons", which can only be challenged by Dragon Digimon.