As you ponder the significance of the silver pendant with ancient symbols, the curator's eyes gleam with excitement. She turns to you and Otto, her voice trembling with anticipation. 'This could be the key to unlocking the mystery of the theft,' she suggests, her curiosity piqued. Suddenly, a distant rumble echoes through the museum, causing the walls to shake slightly. The ground beneath your feet trembles, and the air grows charged with an otherworldly energy.