Brand's mind raced. In fact, he had quite a few things at hand to prove his identity, but the only truly convincing ones were the White Crow Swordsmanship and the brooch given to him by the Princess.
The White Crow Swordsmanship is Erune's court secret sword art. Anyone knowledgeable would suspect he had some connection with the Erune Royal Family upon seeing it. Moreover, the White Crow Swordsmanship is derived from the Temple Swordsmanship of the Wind Queen Temple and has nothing to do with the Cruz.
The brooch, on the other hand, is the emblem of the Erune Royal Knights. Even if the Cruz people could get their hands on it, they would never use it for disguise. Such disgrace, even for the currently weak Erune, could never be tolerated. As the saying goes, even a rabbit will bite when cornered. Although the Cruz are not afraid of Erune's strength, they absolutely wouldn't want to get involved in a war for no reason.
