Darksoul I should have been the one to fill your dark soul with liiiiiiiiiiight!
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Balrog is a fire demon who was Argosax's right-hand man. When Berial was killed, Balrog took the throne of the Fire Hell.[2]

He fought Dante and Lucia in Vie de Marli. After he recognized the great strength of the son of Sparda, he decided to turn into the Devil Arm present in Devil May Cry 5.