You are a Humanoid.

You are Medium or Small. You choose the size when you select this race.

Your walking speed is 30 feet.

You can manifest natural weapons of hardened bark at will that you can use to make unarmed strikes. When you hit with them, the strike deals 1d6 + your Strength modifier slashing damage, instead of the bludgeoning damage normal for an unarmed strike.  Manifesting these weapons takes no action.

Your need to breath is reduced by your ancient heritage.  You can hold your breath for up to 1 hour.

Your ancestors were subject to a living barkskin spell and you were born with a similar shell.  Your barkskin provides you a base AC of 17 (your Dexterity modifier doesn’t affect this number). You can’t wear light, medium, or heavy armor, but if you are using a shield, you can apply the shield’s bonus as normal.

Thanks to your mystical connection to nature, you gain proficiency with one of the following skills of your choice: Animal Handling, Medicine, Nature, Perception, Stealth, or Survival.

You can transform into a tree as an action.  Your treeform looks exactly like you and cannot be mistaken for an actual natural tree.  Until you return to your normal form, you gain a +4 bonus to your AC, and you have advantage on Strength and Constitution saving throws. While in your treeform, you are prone, your speed is 0 and can’t increase, you have disadvantage on Dexterity saving throws, you can’t take reactions, and the only action you can take is a bonus action to return to your normal form.