Kip. 9: There and Back Again
The party discovers the mirror is actually a gate linking the sewers of Water Town with the green moon, allowing goblins to enter. As Lizard Priest works to remove the mirror from the wall, the rest of the party repel the goblin counterattack led by the Goblin Champion. Once the mirror is loose, Goblin Slayer has the party take shelter under it while Dwarf Shaman collapses the roof. All of the goblins are crushed, but the mirror protects the party, leaving them unscathed. The party encases the mirror in cement and sinks it in the river, as they can't guarantee other goblins won't learn to use it. Goblin Slayer reports to Sword Maiden, revealing he suspects she knew more than she let on. Sword Maiden admits the giant alligator is her familiar that guards the sewers, while the mirror was placed by a cult of demon worshipers who were already wiped out by the Hero. Even though the masterminds were taken out, Sword Maiden delayed doing anything about the goblins because she secretly wanted other people to understand the cruelty goblins are capable of. Goblin Slayer merely replies he cannot save her from her trauma, but he will kill goblins if she asks him, even in her dreams, which seems to alleviate her worries. On the way back to their town, Goblin Slayer tells the rest of the party he plans on making ice treats, and the party promise to help him. (Source: Wikipedia)