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In front of Arthurious, there was a strange Hectarious. His brother had suddenly changed for the worst, as a monstrous squid was taking over his head, his entire body was changing and mutating, as tentacles grew over his entire body grotesquely. Arthurious mother looked at the monstrous being that was once her stepson, as she began to wonder where everything went so wrong…
Well, since she became her husband's concubine that Hectarious was already wicked, his mother had taught him to be someone that didn't had any shame in pointing out the flaws and weakness of others, and that he had to be "brave" or well, an asshole to show off he was strong unlike those that were weak and allowed others to abuse them. She taught him that he should rather be the one to abuse than the abused.
Check "The Protagnist's Sister Is Actually the Strongest"!