It is said that Belphemon Sleep Mode awakens from its eternal slumber once in a thousand years. When it awakens, it regains its natural shape and changes into an incarnation of rage, and anything that enters its field of vision becomes a target for destruction.
It is said that just by suffering Belphemon Rage Mode's roar, Ultimate Digimon and below will have their data disintegrated and will instantly die, and not even Mega Digimon can escape unharmed.
Since there is not much belphemon picture on the net. I contribute some.