In the spring of the Well of Eternity, Roy hid the sword embryo. He wasn't worried that the future explosion of the Well of Eternity would blow the sword embryo away because he knew that the location of the Well of Eternity would not change. The spring would at most form a massive vortex in the future, but the Maelstrom couldn't move and couldn't take the sword embryo away.
After Roy returned to his original position, he saw Julia and Benia, who had completed their advancement.
Needless to say, after Roy provided Benia with the high-level angel's Ouroboros Mark, she had successfully synthesized her own divine spark. The power of her divine spark was also quite interesting. It was of the mind crowd type—Enslavement!