Bark Dryad's Awakened Tree

False Appearance. While the tree remains motionless, it is indistinguishable from a normal tree.

Thorny Body. At the start of its turn, the tree deals 7 (2d6) piercing and 7 (2d6) bludgeoning damage to any creature grappled by it. (This does not apply to the Grasping Roots)

Multiattack. The tree can make two slam attacks, or one grasping roots and one slam attack.

Slam. Melee Weapon Attack: +8 to hit, reach 15 ft., 1 target. Hit: 15 (3d6 + 5) bludgeoning damage. On a hit the target must make a DC 15 Strength or Dexterity saving throw or be grappled. While At the start of the targets turn it can repeat the save, on a success it escapes. 

Sweep. Any creature within 30 feet of the tree must make a DC 15 Dexterity saving throw. On a success they take no damage. On a fail they take 18 (4d6+5) bludgeoning damage and are knocked prone.

Grasping Roots. The tree can choose any 5ft. square within 40 feet of itself. Any creature in that square must make a DC 15 Dexterity check or be grappled and restrained as roots erupt from the ground around it. As a bonus action the tree can move any target grappled by it in this way up to 30 feet towards its trunk. At the start of its turn the target can make a DC 15 Strength or Dexterity saving throw to free itself. 

Release. If the tree has a creature grappled it can use its reaction to release the creature.