When the Yillis researched concrete infrastructure, they put their minds to the test and constructed a huge wall protecting its east and northern fronts from an invasion (particularily Bruvka) With the wall comes thousands of cannons and trebuchets with hundreds of thousands of men armed with crossbows; the Yill'ae Empire has become a very developed empire—and an influential one at that. To any neighboring countries who want to enter the Yill'ae Empire, you must be trusted by the wall guardians (this is to make sure no one invades or wreaks havoc in this glorious empire)
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