Cassandra's Ignition Disk

A fiery wheel springs forth from your fingers rolling forward in a 60-foot long, 5-foot wide line. Each creature in the line must make a strength saving throw. Huge or larger creatures automatically succeed the saving throw.

On a failed save the creature takes 8d6 fire damage, and is pushed along the line take an extra 1d6 fire damage for every 10-feet they are pushed by the flaming wheel. On a successful save the creature takes half of the initial damage and is not pushed. All flammable objects within the 60-foot line are set ablaze.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the distance of the line increases by 10 feet for each slot level above 4th.