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Kheseerad, the Demon God of Foreign Trespassing always thought of himself as vastly superior to other gods.
Due to being part of a special caste of creatures that once existed before Genesis was destroyed, and as its only survivor, he always thought of himself as someone vastly superior to his entire race and that of other races.
And even more, after he developed the unique powers of his race, which were the uniquely rare Space Attribute Magic.
Although there were other races in the world of Genesis capable of wielding it, they were often incredibly rare and seen as talented amongst talented people. Space Attribute Magic was just as rare as Illusion Attribute, if not way more.
Check "The Protagonist's Sister Is Actually the Strongest"!