Curse Storm

Round 1. A churning storm cloud forms, centered on a point you can see and spreading to a radius of 360 feet. Flying skulls come down from the sky, spewing curses at each creature in the area, thunder booms, and winds roar. Each creature cursed at by the skulls when they appear must make a Wisdom saving throw. On a failed save, a creature takes 2d6 necrotic damage and has disadvantage on all saving throws for the duration of the spell.

Each round you maintain concentration on this spell, the storm produces more effects on your turn.

Round 2. Each creature cursed at by the skulls must make a Wisdom saving throw. On a failed save, a creature takes 2d6 necrotic damage and has disadvantage on attack rolls against you.

Round 3. Each creature cursed at by the skulls must make a Wisdom saving throw. On a failed save, a creature takes 2d6 necrotic damage and has their movement speed halved.

Round 4. Each creature cursed at by the skulls must make a Wisdom saving throw. On a failed save, a creature takes 2d6 necrotic damage and becomes frightened of you.

Round 5. Each creature cursed at by the skulls must make a Wisdom saving throw. On a failed save, a creature takes 2d6 necrotic damage and becomes paralyzed 

Round 6. Each creature cursed at by the skulls must make a Wisdom saving throw. On a failed save, a creature takes 2d6 necrotic damage and has their hit point maximum halved.

Round 7. Each creature cursed at by the skulls make succeed a death saving throw. On a failed save, a creature dies.