Seven Great Demon Lords is a collective term for the strongest Demon-type Digimon. Usually, they don't interfere with each other, neither cooperate or become hostile with each other regardless of their interests or disagreements.
They were once high-ranking Angel digimon, rulers of dartrkness.
Part 1 https://www.dailymotion.com/video/x92yobs
Part 2 https://www.dailymotion.com/video/x935sae
Part 3 https://www.dailymotion.com/video/x93ijmm
