Weeping Willow

Weeping Screech. The willow has the ability to release a deafening scream that can bring any creature to it's knees. Upon hearing the screech, any creature within a 120 foot cone around the willow must succeed a DC 15 Constitution saving throw. On a failed save, the creature takes 2d10 psychic damage and become prone. On a successful save, the creature only takes half the damage

Multiattack. The willow makes two attacks: one with it's rock and two with it's claws

Claw. Melee Weapon Attack: +4 to hit, reach 10 ft., one target. Hit: 18 (3d8 + 5)  slashing damage.

Rock. Ranged Weapon Attack: +4 to hit, range 60/180 ft., one target. Hit: 28 (4d10 + 6)  bludgeoning damage.

Summon Blights. The willow corrupts one or two plants it can see within 60 feet of it. Once corrupted, the plant transforms into a twig blight. The blight acts as an ally of the willow. The tree remains animate for 1 day or until it dies; until the willow dies or is more than 120 feet from the tree; or until the willow takes a bonus action to turn it back into an inanimate plant. The plant then takes root if possible. 

Barkskin. The willow can reinforce and grow a protective layer of bark over itself as a defence. As a reaction to an attack, the willow can add +2 to it's armour class. The barkskin disappears if the willow ends it with a bonus action, or when a creature makes a successful attack against it.