The Nightrime Hourglass appears as an intricate hourglass crafted from translucent azure ice crystals and ornate metallic bands. Its surface shimmers with patterns of faint circuitry and runes, while its core glows with an inner blue luminance. The artifact exudes a subtle chill and can subtly distort the flow of time in its vicinity.

The Nightrime Hourglass passively influences events without active agency, altering the perceived flow of time and occasionally revealing ghostly impressions of past or future moments. Its chilling presence enhances supernatural winter energies and can temporarily freeze nearby obstacles or hazards.