Your Constitution score increases by 2, and your Wisdom or Strenght score increases by 1.

Due to your scales and the shape of your body, you are ill-suited to wearing armor. Your armored body provides ample protection, however; it gives you a base AC of 17 (your Dexterity modifier doesn’t affect this number). You gain no benefit from wearing armor, but if you are using a shield, you can apply the shield’s bonus as normal.

A 5ft tongue that can be used as an extra hand.  It is able to manipulate small objects. You may make skill checks at a distance at a -2 penalty with it.

As an action you can curl up into a ball to increase your AC. You gain a +3 bonus to your AC and advantage on constitution and strength saving throws.  While curled up, you are prone, your speed is 0 and can’t increase*, you have disadvantage on Dexterity saving throws, you can’t take reactions, and you can't take actions other than a bonus action to "Rollout" or uncurl.

*See Rollout.

While you are in a Defense Curl you can use a bonus action to travel a full 30 feet trampling every creature you hit until the end of the action. Any creature in your path must make a Dexterity Saving Throw. 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 6th level, 4d6 at 11th level, and 5d6 at 16th level. After using this action, Defense Curl ends and the next attack against you has advantage.

A creature with tremorsense can detect and pinpoint the origin of vibrations within a specific radius, provided that monster and the source of the vibrations are in contact with the same ground or substance. Tremorsense can't be used to detect flying or incorporeal creatures.