One might be wondering, why go through so much trouble? There must be an easier way of doing this, right? Well, Roan didn't just want to create a new ID; he wanted a story behind it. If they were investigated in the future, they would reach this place and find out that the twins' group was taken from a destroyed tribe. There would be nothing else after that.
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As mentioned before, Enrel City was neither big nor small. It was a pretty average city in the Divine Realm of the A1 Universe. Still, it housed several hundred million inhabitants.
The lord of the city was a Space-Bending Realm Expert named Gluan, and the main clans, sects, organizations, and the like around had leaders at the same level or slightly weaker. That was perfect for the twins, as the only ones that could possibly notice their pretense were likely Divinity Realm experts or higher.