Your constitution score is increased by 2. 

When an Ent rests they do not entirely fall asleep. Since falling asleep willingly could mean that they don't wake up for several hundred years they try their best to never truly fall asleep, but they still get the benefit of long rests and short rests after being inactive and motionless for 4 hours. You are also the creature type of plant instead of a humanoid.

Ents are very knowledgeable about the forest and know how to survive in it. As a guide Ents are great, but as companions not so much. Their ancient lives and almost extinct race make them feel very isolated and alone. They can be hostile even toward friends and can be temperamental. 

Because of this knowledge they hold they gain proficiency in the nature and arcana skills. 

Ents are rather large, towering between 6 and 15  feet tall it is hard for them to go unnoticed. Even more so, Ents are very different from one another. Some ents look more humanoid while others can look almost animalistic. With branches growing out of them at weird angles and leaves littering their form most Ents are accepted with distaste if they are accepted at all.

Your carrying capacity and push drag lift are doubled, and creatures of your size or smaller have disadvantage on grappling you. You are, however, vulnerable to fire.

You are a powerful and big creature, but your size is still medium. 

Your movement speed is slower than most other smaller, humanoid adventurers. Your movement speed is 25ft.

As an ent you know Common, Primordial, and Sylvan

You have a natural armor equal to 10 + Dexterity bonus + Constitution bonus because of your thick bark.