Darkskull

Wondrous item, rare

This hideous relic is crafted from the necrotically empowered skull of a fallen fiend. Any creature touching it gains the benefits of protection from good. In addition, an evil creature can meditate on the darkskull for 1 minute in order to create a magic circle centered on the darkskull that repels (or traps) celestials, lasting for 1 hour and moving with the wielder. This magic circle cannot be forced against a celestial; doing so causes it to collapse.

An evil creature with at least 10 Hit Dice can concentrate on the darkskull for 24 hours to create a hallow effect that repels celestials. This effect is stationary.

Using a darkskull requires no material components.