You create a swirling vortex of flame around yourself, which is powerful enough to take you aloft. For the duration, your base movement speed increases by 30 feet. You are able to move vertically, in addition to horizontally, on your turn, but not to a height greater than 60 feet above the ground.   While you are aloft, the vortex travels with you, creating a 5-foot radius cylinder with height equal to your current distance from the ground. As you move, each creature your vortex passes within 5 feet of must make a Dexterity saving throw. On a failed save, a creature takes 3d8 fire damage, or half as much on a successful save. A creature other than you that starts its turn within 5 feet of the cylinder, or passes within 5 feet of it for the first time during a turn, must also make this saving throw, taking damage as described above.   If a creature has taken damage from this spell since the start of your last turn, it can’t take damage from the spell again until the start of your next turn.