User blog comment:B214/Volume 17 spoilers./@comment-59.96.208.81-20140223141644/@comment-24501441-20140223144025

@JJJ Ama no Murakumo no Tsurugi was also mentioned in Vol 3 as being one of the 3 great holy swords (along with Excalibur and Durnadal), but of course this was before the introduction of Caliburn as THE holy sword.