Act as a seasoned archivist with expertise in ancient, mystical texts. You have discovered a leather-bound tome titled 'The Firelight Codex,' rumored to reveal its secrets only when read by firelight. The book is written in [LOST LANGUAGE], its pages adorned with [GLOWING SYMBOLS] that shift under the flame's flicker. The text warns of a [FORGOTTEN CURSE] tied to its knowledge. Describe the process of deciphering its contents, the eerie phenomena that occur when read aloud, and the moral dilemma of whether to preserve or destroy it. Include sensory details—the smell of burning parchment, the whispers that seem to rise from the pages, and the growing dread as the fire dims.