You can speak, read, and write Common, Sylvan, and Druidic.

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

The oldest of the Arboreus have seen forests grow from a single seed to a vast expanse of land. An Arboreus comes into sentience after a century spent asleep, and can live up to 3000 years old. Currently the oldest Arboreus on record is 5000 years old. 

Arboreus can grow to 9 ft tall. Your size is Medium.

The Arboreus walks for 30ft.

An Arboreus' skin is made of tough bark, giving them a natural armor of 16 and resistance to bludgeoning and piercing damage. However that same bark skin makes an Arboreus vulnerable to sustained fire damage (such as being set on fire).

Arboreus are creatures of the forest. The power imbued upon them by ancient druidic traditions during their century-old slumber grants them the ability to communicate with all naturally grown plants. You have advantage on all Charisma checks you make to influence them. At 1st level, the ancient druidic powers within you sprout, and the Arboreus knows the druidcraft. At 3rd level, the ancient druidic powers within you grow, allowing you to better fulfill your role as a shepherd of nature. You can cast plant growth once per long rest as a ritual. At 12th level, the ancient power takes root, connecting you with trees once visited on this plane of existence. You can cast transport via plants once per long rest as a ritual. 

You count as one size larger when determining your carrying capacity and the weight you can push, drag, or lift.