As an action, you transform your body into living oak. Until the spell ends, you have resistance to nonmagical bludgeoning, piercing, and slashing damage. You have vulnerability to fire damage, but you are immune to blinded, deafened, disease, poisoned, and stunned condition. You cannot drown as you have no physiology or respiration while this spell is in effect. You cannot drink (and thus can’t use potions) or play wind instruments.
You have advantage on Strength checks and weapon attacks using Strength. Additionally, your unarmed attacks deal 1d10 bludgeoning damage and are considered magical.