Arbor Mortus

In one way or another, you have been bestowed with a boon by a very powerful nature-based being. Turning parts of your body to a bark like texture and strength. This has both its advantages and disadvantages, but overall, you are now stronger because of it. 

Arboreal Weakness. You have disadvantage on saving throws against fire.

Large Stature. Your height increases by 3d4 inches, and your weight increases by 5d10 pounds.

Nature’s Armor. Due to your barked skin and the shape of your body, you are bestowed with a natural bark-like armor. While unarmored, your bark provides ample protection, giving you a base unarmored AC of 11 + your Constitution modifier. You do not gain this benefit while wearing armor, but if you are using a shield, you can apply the shield's bonus as normal.

Nature’s Resilience. You have resistance to poison damage, and advantage on saving throws against poison.

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