"Excalibur?" Rokurou mused thoughtfully. "I think I read something about it in one of the books in the Library." Because if he was going to read anything, it would obviously have to deal with swords. That said, even if Rokurou delved into the Arthurian legends, given how dense and expansive the collection was, it would not be surprising if his interest faded before finding the more interesting stories.

But his answer at least provided a hint that he had never heard of it from his world, only in this. And as to that purifying energy... He could indeed sense something like that, something reminiscent of the "holy" or "light" element artes the malakhim and exorcists of his world used, but he wasn't bothered in the slightest. If anything, it just made him all the more curious.