Green Celestial Treant (Starwood)

Charge. If the treant moves at least 20 feet straight toward a target and then hits it with a maul attack on the same turn, the target takes an extra 1d6 bludgeoning damage. If the target is a creature, it must succeed on a Strength saving throw against your spell save DC or be knocked. 

Primal Bond. You can add your proficiency bonus to any ability check or saving throw that the treant makes. (Included)

Maul. Melee Weapon Attack: +3 to hit, reach 5 ft., 1 target. Hit: 1d8 + 6 Bludgeoning damage. 

Healing Embrace.  Usable once per short rest. As a bonus action, you can reach out and touch another creature to heal its wounds. The creature is healed 1d6 points of damage per every other character level you possess, for a maximum of 10d6 of healing at 20 level.