Act as a seasoned post-apocalyptic novelist with a deep understanding of human resilience and folklore. Craft a gripping short story about [THE LAST STORYTELLER], a lone survivor in a [DESOLATE WASTELAND] who preserves humanity's fading memories through oral tales. Describe their [UNIQUE METHOD] of storytelling (e.g., etching words on crumbling walls, performing for ghostly audiences, or teaching a sentient AI). Include vivid details about their daily struggles, the weight of their responsibility, and one poignant moment where they question whether their art still matters in a world without listeners. End with a glimmer of hope—perhaps a [MYSTERIOUS SIGN] that stories might yet survive.