Ashul Edwaru

Ashul Edwaru is the Craftsmaster who created the 13 Month Series. He is also the author of the book "Of the Tower's Weapons". He starts the book by explaining that all weapons in the Tower are modeled after the weapons that Zahard and the 10 Great Warriors brought with them when they entered the tower. This means that the weapons were originally designed for battle in a space filled with air or vacuum, and not one filled with Shinsoo. All weapons therefore had to be redesigned to suit for use in shinsoo.

He end by stating that understanding shinsoo is essential if one wish to understand weapons.