Cromwell's Forbidden Sun

You Conjure a brilliant flame in your hand and hurl it at a target within range dealing 8d6 fire damage upon impact in a 20 ft area. This spell then leaves a pool of fire on the ground that deals an additional 4d6 fire damage over the course of 1d4 rounds in a 10 foot area of which the flame impacted originally. On a successful DEX save only half of the damage is applied on the initial burst.