When Seiya erupted with Semi-Demon King-class demonic power, Rias and the others were already utterly shocked.
This level of demonic power was already comparable to that of a Ten-Winged Fallen Angel Executive.
Yet what none of them had expected was that this was far from Seiya's limit. Even after his demonic power reached the Semi-Demon King level, it showed no signs of stopping and continued to surge madly.
When Seiya's demonic power rose to the Demon King level, not to mention Yuuto Kiba and the others—even Sona and Rias, two Pure-blood High-ranking Demons, could no longer remain standing beneath the crushing pressure of that power.
When Seiya's demonic power reached Demon King Class, a level comparable to a Twelve-Winged Angel, Kokabiel completely gave up any thought of resisting.
The approximate power hierarchy of Devils, Angels, and Fallen Angels was:
Low-Class Devils, Two-Winged Angels, Two-Winged Fallen Angels.
Middle-Class Devils, Four-Winged Angels, Four-Winged Fallen Angels.
High-ranking Demons, Six-Winged Angels, Four-Winged Fallen Angels.
Ultimate-Class Devils, Eight-Winged Angels, Eight-Winged Fallen Angels.
Semi-Demon Kings, Ten-Winged Angels, Ten-Winged Fallen Angels.
Demon Kings, Twelve-Winged Angels, Twelve-Winged Fallen Angels.
Super Demon King Class, the Four Great Angels of Heaven, the Fallen Angel Governor-General.
Transcendents, Chief god Class, Heavenly Dragon Class.
Dragon god Class!
Though Demon King Class and Ten-Winged Fallen Angels were only one rank apart, the gap in strength between them was like heaven and earth.
A Low-Class Devil was like an ant before a High-ranking Demon, while a Semi-Demon King could easily destroy an entire city.
A Demon King, however, could effortlessly erase a small nation from the map with a mere gesture.
Those of Super Demon King Class, such as Leviathan and Asmodeus among the current Four Great Demon Kings, could already easily destroy an entire continent.
The Transcendents, Chief god Class, and Heavenly Dragon