In human guise, Caseldown is a bright-eyed woman with a dancer's spring-loaded balance and a smile that seems to arrive a heartbeat before she does. Her skin has a warm, sunlit sheen, and her silver-blue hair is braided with tiny bells that barely sound unless she turns sharply. In dragon form, she is long-bodied and fine-scaled, with the elegant general shape of a copper dragon but a narrower chest and iridescent scales that shift from glacier blue to moonlit silver. She has no visible wings; the air seems to gather beneath her as she rises. She smells unmistakably of rosewater and hot beeswax, a scent she knows clings to her vestments. A small brass handbell always rides at her belt, its grip polished smooth and its clapper worn flat from years of use. Her dancing is exuberant rather than dainty, all sudden turns, sweeping reach, and abrupt, birdlike stillness.

Caseldown is extravagantly welcoming in public and sharply calculating in private. She loves applause but is not vain about it, and can turn from a joke to a hard security question without losing her warmth. In a crisis she grows more animated, issuing brisk commands and moving constantly. When grieving, she becomes restless and throws herself into organizing other people's needs rather than speaking about her own.

Caseldown came to Hill's Edge decades ago and made a home among the city's dancers, shrine keepers, and street musicians. Her human appearance and tireless enthusiasm made her a natural public face for Lliira's Church of Joy, where she rose to become high priestess. She became renowned for acrobatic dances performed in courtyards and for a high, clear voice that carried above market noise without seeming to strain. Rumors of strange magic followed her, but she kept her draconic nature private. Her life changed during a night when agents of Cyric's church incited violence at a festival. Caseldown chose to remain in human form and lead frightened revelers through smoke and falling debris rather than reveal herself and scatter the crowd. The delay cost lives, and she has never again mistaken celebration for safety. Since then she has quietly worked with the Harpers to protect Hill's Edge from the Church of Cyric and the Zhentarim, while defending the city's culture as fiercely as its streets. She is beloved by many residents as the Rose-Red Lady. Her closest confidante is Jhanadra, a Harper who distrusts Caseldown's instinct to carry every danger alone. Now factional pressure is growing, and a missing Harper message suggests someone has learned enough to threaten both her secret and the city.