You are made mostly of wood thus fire will do extra damage.  However you are resistant to Piercing and Bludgeoning damage.

Your walking speed is 20 ft

Barkers tend to be self sufficient and rarely involve themselves with other races However most will take up ANY job for the right price or reason therefore most are Neutral

Most Barkers who reach the age of travel (25) are about 3-5 Ft tall (Medium size)and can weigh up to 150 lbs.  They grow bigger as the years pass becoming 6-9 Ft tall (Large) 250-450 lbs or even 10-25 Ft tall (huge) 500 lbs or more

When you make a melee attack on your turn, your reach for it is 5 feet greater than normal.

If you surprise a creature and hit it with an attack on your first turn in combat, the attack deals an extra 2d6 damage to it. You can use this trait only once per combat.

If you stand still for 1 minute you become indistinguishable from a normal tree unless seen moving beforehand. This gives you a +10 to a stealth roll

You can speak, read, and write Common and one other language of your choice.

Being made of wood and living around trees for many years makes you an Expert working with it

Your Constitution ability score increases by 2, your Wisdom ability score increases by 1, and your Dexterity score Decreases by 1

Barkers cannot uproot themselves until they reach 25 years old.  As a tree your lifespan can be anywhere from 100 to 5000 years depending on what kind of tree you are.  As you age the urge to stay rooted grows 

As a tree you grow with time and each time you gain a level your hp increases by 2 points

As a tree you have no eyes, however you can perceive with your other senses (as if with sight) in a 60 foot radius around yourself.  You can not see ANYTHING beyond this

Any armor must be custom made and fit onto your form causing it to take a long rest to don or doff armor.  As time/levels pass the armor begins to mold into your form making it part of your body and causing you to take damage if you attempt to remove it.  you take 1d8 damage per lvl to remove it

You have the ability to cast the "Speak with Plants" spell at will

As a bonus action you can dig your roots into the ground (Strength check based on terrain) becoming Rooted in place. When your roots are dug in your speed drops to 0 and you gain a +4 to damage rolls on melee attacks.  You also gain advantage on strength checks and saving throws but automatically fail all dexterity checks and saving throws.

You don’t need to sleep, and magic can’t put you to sleep.  Instead you must remain Rooted for at least 6 uninterrupted hours to obtain the benefits of a long rest

When you plant your roots you gain Tremor Sense up to 120 feet, becoming sensitive to vibrations in the ground and can automatically pinpoint the location of anything that is in contact with the ground and within range.