User blog comment:Zack Tan/Volume 7 Intermission/@comment-33177490-20150903224517

"Even though I have done some preparations, but I still need your assistance. I want you to collect information on weapons that can rival or are even stronger than that sword, which is a guild weapon. Or other information regarding the adamantite adventurers in the Kingdom such as the group Red Drop that uses special YGGDRASIL items that strengthens their armor."

It seems like there are still YGGDRASIL players remaining in this world or else it is just YGGDRASIL items left by them before passing away and then Red Drop obtained it afterward.