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

Age, to treants, is a trifle thing. Time passes with the
seasons, and treants can age decades and grow only a few
feet. As a young treant, you might be of any range from newly
awoken to half a millennium.

Treants are almost always some alignment of
good, whether they be carefree and impulsive, or work
consistently with ranger conclaves and druid circles to
protect their world. Neutral treants are somewhat irregular,
but older or more isolated treants sometimes begin to see
more balance than good. Evil treants are nearly never seen,
but if they ever are, they are a truly terrifying force: hunting
and actively harming others who dare to trespass into a pass
of the woods, or even turning on their own kind.

Treants can range from a fresh 8 feet to nearly 18
feet in height, and some trees are stout and round, while
others are tall and thin. You weigh between 700 and 1300
pounds. Your size is Large.

Treants are big, slow, and heavy, but the width of
stride can cover that up. Your base walking speed is 30 feet.

You have vulnerability to fire damage and deal double damage to objects and structures.

You do not need to sleep while in sunlight. Instead, you can choose to sunbathe for 4 hours a day. While sunbathing, you can dream after a fashion; such dreams are the fleeting half memories of when you were still a normal tree. After resting in this way, you gain the same benefit that a human does from 8 hours of sleep, and you are considered fully nourished for the rest of the day. You can still sleep as normal while not in sunlight.

For every week that you go without photosynthesising or spending an equivalent amount of time on the surface in sunlight, you suffer one level of exhaustion.

You can slam your body into a creature. Your arms are natural weapons which deal bludgeoning damage equal to 1d6 + your Strength modifier.

You know the druidcraft cantrip. When you reach 3rd level, you can cast shield of faith spell once with this trait and regain the ability to do so when you finish a long rest. When you reach 5th level, you can cast the barkskin spell once with this trait and regain the ability to do so when you finish a long rest. Wisdom is your spellcasting ability for these spells.

As a bonus action, you can root yourself into the ground, causing your speed to drop to 0. You cannot be knocked prone or otherwise moved against your will while rooted. You can uproot yourself as a bonus action.

You can speak, read, and write Sylvan and another language of your choice. Treants usually know Sylvan and whatever language they were exposed to most often by forest dwellers while they were a sapling, which is normally Common or Elvish.

• The races have advantage on Strength ability checks and Strength saving throws. For this reason, these races are assumed to be strong, and do not need to gain a Strength score bonus they will usually roll high anyway, except on attacks and damage.
• The Large weapons deal an extra 1d4 damage.
• Your normal unarmed strike damage is 2 + your Strength modifier.
• The creature takes up a 10 by 10 foot area. To fit into a Medium area, the creature must squeeze into the space costing double its movement, disadvantage on
  attack rolls and Dexterity saving throws, and attack rolls against it to have advantage.
• The creature's push, drag, lift, and carrying capacity are all calculated for Large size. Push, drag, and lift are 60 times your Strength score while carrying capacity multiplies your Strength score by 30 unless otherwise noted.
• The races are able to grapple and shove Huge creatures.
• If you attempt to handle something very small, such as a vial of acid, the DM may call for a Dexterity check where a smaller sized creature would automatically succeed.
  You require mounts at least one size larger than you as normal.
• You require four times as much food as normal and your armour requires four times the materials to be made. It is about that much more expensive, and that's assuming you can find it. Based on how common these races are in your world, they might be found in populous cities. You also require larger shields, which are more common, but give no bonus to AC outside the norm.