User blog comment:Zack Tan/Volume 7 Intermission/@comment-26968629-20150908025908/@comment-26968629-20150908071617

@SegMaster: in the intermission, PLD said that current magic can't not produce such weapon, so he cant replicate it.

There are players among the 13 Heroes, which PLD was a member, so it's possible that he knew about the guild and what happened after the guild weapon is destroyed. He did called the sword 'Guild Weapon' in this intermission.