Burning Aura

The atmosphere in a 10-foot radius centered around you bursts into flames. This burning area moves with you, and lasts for the spell's duration. The area has the following effects:

• When a creature other than you moves into the spell’s area for the first time on a turn or starts its turn there, that creature must succeed on a Constitution saving throw or take 4d6 fire damage on a failed save. Creatures take half as much damage on a successful save.
• When a creature other than you starts their turn within the spell's area, their speed is reduced by half.
• When a creature other than you makes a Constitution save to maintain concentration, they have disadvantage on the save.
• Attacks and effects that deal fire damage deal 1d6 additional damage.
• Flammable objects not being worn or carried spontaneously burst into flame.
• Ranged attacks have disadvantage if they pass in or out of the area.