Conjure Mortus Fog

Choose a point within range, where you cause a sickly fog to billow and creep until it fills a 15 foot radius sphere centered on the point chosen. The fog causes the area to be heavily obscured, however undead can see through the fog as if it were only lightly obscured. While an undead is within the radius of this spell, they have advantage on all attack rolls, resistance to radiant damage, and if they fail a saving throw, they can use their reaction to reroll, potentially turning the failure into a success.

• At Higher Levels: When you cast this spell with a spell slot of 4th level or higher, the spell’s radius increases by 10 feet per spell level above 3rd.