Chernabog

Chernabog is a large winged creature that can be found exclusively as a boss in Kingdom Hearts.

Story
On their way to confront Ansem, while fighting his legions of Heartless, Sora, Donald, and Goofy encounter the demon Chernabog. He wakes up and promptly attacks the trio, but is defeated after a battle in an explosion of fire. Once defeated, a hole will appear on the mountain where he was standing, leading you deeper into the world.

Appearance
Chernabog is a gigantic, muscular, humanoid demon. His skin is entirely colored black, and he is so large that Sora is roughly the size of his head. His head sports two curved horns; he has four fangs in his mouth, and his eyes are a glowing yellow. He has enormous, black, bat-like wings, and his wingspan is larger than he is tall. Chernabog is always seen trapped from the knees-down in a volcano.

Origin
Chernabog first appeared in Walt Disney's Fantasia, during the Night on Bald Mountain segment, in which he erupts from the mountain in the same way as in the game. Chernabog awakens on top of Bald Mountain on Walpurgis Night, and uses his dark powers to raise ghosts, skeletons, demons, witches, harpies, goblins, and zombies from a nearby town. He summons fire and lava, and makes the wretches in his control dance and fly around, before he destroys them. However, the Angelus bells suddenly begin ringing, heralding sunrise, driving Chernabog and his slaves back into hiding, as a line of monks proceeds through the forest and a ruined cathedral to the sounds of the "Ave Maria".

His name is taken from the Slavic deity Crnobog, whose name means "black god". However, Disney designed him with Satan in mind. His Japanese name, "Demon of Fantasia", references his role in Fantasia, the Disney film he first appeared in.