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This is the 《Demon Lord of the Hands》. For others also called Demon Lord, go here.
《Demon Lord of the Hands, Hattjabul》 is a Demon Lord that was absorbed by the Demon Lord of Insanity, Modinalam.
Hattjabul had the unique ability to keep the martial arts 《Certain Kill》, 《Certain Hit》, and 《Iron Wall》 perpetually activated. This power is inherited by the Demon Lord of Insanity after being absorbed.