Gloom Infusion

You surround a willing target in gloom and shadow, changing their typing to Dark II. As a Dark II type, they take half damage from Dark Damage or attacks with the Dark keywords, unless the attack deals true damage. They take 50% more damage from Holy Damage or attacks with the Holy keyword. While the ward lasts, they also gain 60 feet Darkvision and a +4 bonus to saves against mind affecting effects. 

The ward lasts until the end of the encounter or until their type is overwritten by a more powerful type.