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Frank watched the battle within the seats, he was a bit nervous himself, Arthurious had been practicing this entire time to grow stronger with Blackie, and after a long time of battling against many of the monster pets in the monster nursery, it was finally time to show off his might, and the might of his goat, the goat that had been accompanying him since the beginning of his life.
Arthurious brother stood before him with a cocky and confident smile, he was blonde and rather similar looking to his little brother. Actually, both of them had barely any interactions with one another, the siblings of the child of the Emperor, the father of Arthurious, were very limited, and they often bullied the younger and weaker ones constantly, beating their monster pets into almost dead as well to intimidate them.
Check "The Protagnist's Sister Is Actually the Strongest"!