Divine Comet

You call a mighty comet from the heavens above to slam into the ground in a 30-foot-radius within range. Enemies within the radius must make a Dexterity saving throw, taking 5d6 radiant damage on a failed save, or half as much on a success. Allies within the radius gain half the damage rolled as temporary hit points until the end of their next turn. Additionally, the earth scorched by the divine comet leaves fallout for 24 hours, increasing the movement speed of any of your allies by 10 while in the area.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d6 for each slot level above 5th.