Volatile Javelin

You conjure a javelin out of fire and hurl it in the direction you are facing. Upon hitting an object or creature, the javelin will explode in a 10 foot sphere around the area it landed. Creatures caught in the explosion must make a d12 Dex save, taking 4d8 fire damage on a failed save and half as much on a successful save. Creatures have advantage on their save if they're hit directly by the javelin, however failing will cause them to take maximum damage.