When you cast this spell, you create a 1-foot-diameter ball of gel-like flame that slips from your fingers and rolls up to 70 feet across the ground in a direction of your choice before detonating in a 20-foot radius ball of searing flames. A dense fireball follows the path of least resistance along its trajectory and can even turn corners, but it cannot increase in altitude by any means: it can only go downwards or sideways. If the fireball travels more than 20 feet across difficult terrain or encounters a barrier such as a wall before reaching its destination, it stops and detonates immediately.
A creature caught in the explosion’s radius must make a Dexterity Saving Throw. On a failure, a creature takes 10d6 fire damage and if they are Large or smaller, they are pushed 10 feet away from the explosion's centre. On a success, a creature takes half of the damage and is not pushed. Structures or objects hit with this spell take twice the damage rolled.