Akumu Uchiha is a character made by Ryuu the Ancient Keyblade Master that appears around the end of Soulcalibur Saga: Uchiha Dynasty. Around the end of Uchiha Dynasty, Nightmare used the Gem of Helios in the ancient city of Altantis to copy the chakra from Itachi to gain the Sharingan in both of the Soul Edge and Nightmare, which transformed Nightmare into the demonic clone of Itachi that is called Akumu Uchiha.