You can speak Common and Arcosian.

Your Dexterity score increases by 2, and two other ability scores of your choice increase by 1.

You have a tail that can hold items up to half your carrying capacity. It cannot be used to wield a weapon or use a shield, but can be used for a lantern or torch and perform simple actions. It can also be used to make an unarmed strike as a bonus action, dealing 1d4 + Strength modifier bludgeoning damage. This is affected by your martial die, if you have one.

When you are attacked from behind, as a reaction, you can increase your Armor Class by 2 for that one attack. If this causes the attack to miss, the target has to make a Strength saving throw against a DC equal to 8 + your Strength modifier + proficiency modifier or be grappled. You can only grapple Medium or smaller creatures.

Arcosians only have to take a breath once every 10 minutes.

You gain proficiency in the Intimidation skill.

Starting from level 17, as an action, an Arcosian can assume a Golden Form for up to 1 minute. While in this form, the user's body becomes a beautiful golden color, to their choosing. Their movement speed increases by 15 ft., they can add their modifier twice to any damage roll they make and they make their attacks with advantage. After the form ends, the Arcosian sustains 3 levels of exhaustion. This form can not be activated if the user has any levels of exhaustion.