Deep Magic Volume 2 (p.165)
Dome of Spectral Blows
3-level Conjuration
Casting Time: 1 action
Range/Area: Self (15 ft. hemisphere)
Components: Verbal, Somatic, Material
Materials: a shard of petrified wood
Duration: Instant
Attack/Save: DEX Save
Damage/Effect: Force
Spectral fists fly out from you, pummeling or grabbing at creatures within 15 feet of you. Each creature in the area must make a Dexterity saving throw, taking 6d6 force damage on a failed save, or half as much damage on a successful one. When a creature fails this saving throw, you can choose to forego the damage and restrain the creature with the spectral fists until the start of your next turn instead.
At higher levels: When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd. When you cast this spell using a spell slot of 5th level or higher, the spell’s radius increases by 5 feet for every two slot levels above 3rd.
Available for: Bard, Sorcerer