The arch at the front of the Battle Chateau has some anime language on the top that is actually explained in the episode by Citron. Unfortunately, in this instance the actual letters are just random and don't actually match the description he gives. Anime Language transcriptions:
Citron: "Battle Chateau: Prove your strength with your peerage rank", it says.
（シトロン）: バトルシャトー その強さ爵位で示せ」だそうですよ。
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