Your Constitution score increases by 2, and your Strength score increases by 1.

Space Dragons lean toward evil alignments, but neutral options are not uncommon. Good has never been heard of

Space dragons are typically 10 ft tall when crouched and close to 20 feet when standing tall. As the crouched position is more common you are considered Large

Space Dragons have a walking speed of 20ft, but a flying speed of 35ft

Space Dragons have 60ft of Darkvision

Space dragons are known for their resistance of fire

You can use your action to exhale destructive energy. It deals damage in 15 foot cone. The DC of this saving throw is 8 + Constitution+ your proficiency bonus. A creature takes 2d6 damage on a failed save, and half as much damage on a successful one. The damage increase to 3d6 at 6th level, 4d6 at 11th, and 5d6 at 16th level. After using your breath weapon, you cannot use it again until you complete a short or long rest

You gain one hp at the start of your turn. At 10th level you gain 3 hp. At 15th level you gain 5hp. This trait does not happen when unconscious

You have proficiency with swinging your tail, tail attacks do 1d4+Strength damage

At 5th level you can use your breath attack in a precise beam. It deals 2d8 fire damage. You can only use once per short or long rest. The damage increase to 3d8 at 6th level, 4d8 at 11th, and 5d8 at 16th level

At 5th level you've mastered moving and attacking at the same time, once per long rest you can preform a Melee rush as a bonus action, , Target must make a dex save( 8 + Constitution+ your proficiency bonus) or take 5d8 damage and is thrown 10 ft back(Half if saved, and not thrown)

At 5th level your claws have grown stronger and deal 1d8+Strength damage. Your tail has grown stronger and now does 1d6+Strength damage