You have a limited burrowing speed of 1 foot per round. You do this by slowly pulling yourself under the ground using roots.

Your attunement to nature grants you the power to mingle with its essence giving you the druidcraft spell.

Entopians reach heights from 5 foot to 8 foot (turning into your tree form grows you to the respectful height)

Your hearty nature grants you a bonus of 1 to your constitution score and your long life and many life experiences grants you a plus 2 to your wisdom score.

your attunement to nature and the fey wild grants you the ability to speak sylvan, however, you also know Entish (not official D&D material) which is a dead language known only by the Entopian race.

Entopians reach ages up to thousands of years. legend says that the first creature ever made was an Entopian and he still lives to this day hidden somewhere in the plains.

the power of the fey wild and your tree like appearance grants you the ability to take the form of a tree for a period of time if you are standing on dirt. You  gain the ability to do this once per day. This period of time that you can maintain your tree form is the amount of hours equal to your wisdom modifier times 2. (you can rest in this form, and will gain back your use of this if you take a long rest within tree form). All equipment that you carry or wear, meld into this form as well. You can end this effect at any time using a bonus action. while in this form you appear like a normal tree, but a detect magic spell reveals you to have a slight transmutation aura, and a dispel magic spell ends your disguise early. You also share the same hitpoints as your character.

your weakness to fire is one thing, but you are a tough creature allowing you to take bludgeoning and poison damage easily. (You have vulnerability to fire damage, but resistance to bludgeoning and poison damage)