You cause vengeful spirits of the wrongfully slain to manifest in a 30-foot-radius sphere centered on a point you choose within range. The sphere of spirits spreads around corners and lasts until the spell ends.    When a creature enters the spell’s area for the first time on a turn or starts its turn there, that creature must make a Wisdom saving throw. On a failed save, a creature takes 3d6 cold and 3d6 necrotic damage and has disadvantage on attack rolls until the end of its next turn. On a successful save, a creature takes half the damage and doesn’t have disadvantage on attack rolls.