It was not the Black Dragon Emperor but the soul of the incarnation of the Black Dragon. However, the Dragon Flame was still powerful and burned an Egyptian National Beast like the Sphinx into two pieces.
From the Dragon Flames, two balls of flame fell to the ground. One was the Sphinx's upper body, while the other was the waist and hind legs. They were burnt to crisps!
The vast army froze at this moment as they witnessed the fiasco of Khufu's messenger.
The Sphinx had an undead body. Its whole body was full of flames. The two parts of the body that fell to the ground were still breaking off. Groups of mummies rushed to the Sphinx. They continued to cast Egyptian magic and even used the Pharaoh's Source to reconnect the Sphinx's body.