Kirito and the others are taking on Thrymr, the Boss lurking at the bottom level of the dungeon. But unable to make much of a dent in Thrymr's HP, they soon find themselves in grave danger - getting blasted by a freezing air attack. Just then, their new ally, Freyja, raises her voice. She informs the party that to defeat Thrymr, they will need her tribe's secret treasure, the Golden Hammer. Using a Thunder-type Skill, Kirito discovers the hidden Golden Hammer. He tosses it to Freyja, but...