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The Gale Bird Emperor had changed from back then. He no longer had a wounded wing, he was strong, and he knew he could defeat his opponents if he used this new power he had acquired, which he had been training ever since he became an Undead God as high as a Pseudo Supreme God.
He still recalled the pathetic way in which he died, embraced by slimes and poisoned to death, such a terrible death brought to him tremendous disgrace, and an incredible sense of resentment like nothing has ever made him felt before.
Since he was alive, however, that he was already corrupted by greed and selfishness, disregarding, and sacrificing his own siblings, the other birds, as if they were mere pawns that were made to sacrifice themselves and die for him.
He was selfish and incredibly egocentric, and challenged the Mountain Monkey Emperor when he thought he could stand a chance after he evolved into an Emperor… However, that only ended badly for him.
Check "The Protagonist's Sister Is Actually the Strongest"!