Desecrate

You imbue a 20-foot radius sphere within range with negative energy. Any undead in this area have advantage on their saving throws. If the area includes an altar to your god, or a desecrated altar to an enemy god, then any undead in the area also gain resistance to nonmagical bludgeoning, piercing, and slashing damage. If an undead creature is animated, created, conjured, or summoned in the area, it gains temporary hit points equal to its Hit Dice as soon as it appears.