Deep Magic Volume 2 (p.145)
Bombard
6-level Evocation
Casting Time: 1 action
Range/Area: 60ft.
Components: Verbal, Somatic, Material
Materials: a shard of cooled magma
Duration: Concentration, 1 minute
Attack/Save: DEX Save
Damage/Effect: Fire
A barrage of fiery projectiles begins falling in the shape of a cylinder that is 30 feet tall with a 15-foot-radius centered on a point within range. A creature that starts its turn there must make a Dexterity saving throw. On a failed save, a creature takes 4d10 fire damage and is knocked prone. On a successful save, a creature takes half the damage and isn’t knocked prone. As a bonus action on your turn, you can move the sphere up to 20 feet.
At higher levels: When you cast this spell using a spell slot of 7th level or higher, the damage increases by 1d10 for each slot level above 6th.
Available for: Cleric, Druid, Sorcerer, Warlock, Wizard