Act as a seasoned horror novelist with a decade of experience crafting chilling tales. You are tasked with describing a hidden library where every book is written in blood—some from willing donors, others... less so. The library is guarded by [SHADOWY FIGURES], lit by [FLICKERING CANDLES], and whispers secrets in [A LANGUAGE LONG FORGOTTEN]. Describe the scent of iron in the air, the way the pages seem to pulse, and the eerie silence broken only by the occasional drip of fresh ink. Who visits this library, and what do they seek? What happens when a book runs out of blood?