Homebrew
You have resistance to fire damage.
Your internal body burns at profound heats making the flames under your scales ignite all who surround you. Each creature in an 5 feet radius centered on you must make a Constitution saving throw (DC = 8 + your Constitution modifier + your proficiency bonus). A creature takes 2d6 fire damage on a failed save, and half as much damage on a successful one this effect lasts for 1 minute. The damages increases to 3d6 at 6th level, 4d6 at 11th level, and 5d6 at 16th level. After you use your ignited scales, you can’t use it again until you complete a short or long rest.
Starting at 5th level, as an action, you can channel your draconic energy to protect yourself. For 1 minute, have resistance to cold damage and become immune to fire damage. Once you use this trait, you can’t do so again until you finish a long rest.
When your scales are ignited your speed is doubled and wherever you step is considered burning ground anyone who ends their turn where you have ran past takes 1d6 fire damage.