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This is the «Demon Lord of the Heart». For others who were called Demon Lords go here.
《Demon Lord of the Heart, Cardia》 is the Demon Lord sealed in 《The End》 in the Kingdom of Greenwood.
Cardia appears to have a large grotesque figure with numerous black tentacles, but its actual body is still sealed away and its form is merely an illusion.
When God split apart the Originator Demon Lord, Cardia was sealed in the Kingdom of Greenwood and the royal family was ordered to guard the seal.
Cardia's abilities were used by the Demon Lord of Insanity Modinalam after being absorbed by him. After Modinalam was destroyed by Diablo, Cardia whom was absorbed by the Demon Lord of Insanity was destroyed along with him.