Given Illidan's overwhelming strength, it's actually not surprising that he could easily eradicate several Demon King level powerhouses, but at the moment when both sides clashed, many more than just those Demon King level powerhouses struck by Illidan met their doom.
Apart from him, among the directions the Seven Great Demon Kings launched their attacks, another Demon King level powerhouse also fell instantly. Especially the most outstanding Proud Demon King Ilya, who arrogantly swung her sword and directly took down two Demon King level powerhouses.
"Damn it! We've been deceived! Those Abyssal Demons had already sided with Illidan! The intel they sent was all fake! The Seven Great Demon Kings are not merely close to being demigods; they are indeed Demigod Demon Kings!"
