Allister's Incinerating Ash Cloud

The caster gathers a pinch of ash and a drop of their blood into the palm of their hand. The caster then blows the ash and blood out into a 40 foot cone or a 20 foot radius sphere centered on the caster. The cloud then explodes into an eruption of incinerating flame causing 8d6 fire damage to all creatures within range. Any creature in range must make a Dexterity Saving throw. On a successful save, the creature takes half damage, but full damage on a failed save.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher you deal 1d6 more damage per spell slot used above 4th.