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

You age at the same rate of humans and live to be around 80.

Abishai tens to extremes, making a choice between good and evil (represented by Bahamut and Tiamat). Most abishai are evil, but those who are good can become great heroes. 

Abishai are taller and heavier than humans, standing well over 6 feet tall and averaging almost 240 pounds. Your size is medium.

Your base walking speed is 30 feet. You have a flying speed of 40 feet.

Choose one type of dragon from the table below. Your breath weapon and damage resistance are determined by the dragon type, as shown in the table.

Breath Weapon: When you use your breath weapon, each creature in the area of the exhalation must make a saving throw, the type of which is determined by your draconic ancestry. The DC for this saving throw equals 8 + your Constitution modifier + your proficiency bonus. A creature takes 2d6 damage on a failed save, and half as much damage on a successful one. The damage increases to 3d6 at 5th level, 4d6 at 10th level, 5d6 at 15th level, and 6d6 at 20th level.        After you use your breath weapon, you can’t use it again until you complete a short or long rest.

Draconic Resistance: You have resistance to the damage type associated with your draconic ancestry.

Your dragon scales provide natural protection against attacks. While not wearing any armor, your armor class is equal to 13 + your Dexterity modifier. This ability still works if you are wearing a shield.

Thanks to your Draconic gifts, your claws can be used as an unarmed strike. Your unarmed strike deals 1d6 + your Strength modifier slashing damage.