Treant and Treant Druid

Here are some modifications I have made to treants that I think are appropriate:

Senses darkvision 60ft., passive Perception 13

Speak with Plants. The treant can communicate with plants as if they shared a language.

Slam. Melee Weapon Attack: +10 to hit, reach 5 10 ft., one target.
Hit: 16 (3d6 + 6) bludgeoning damage.

Note: an awakened tree (CR 2) has a Slam attack with a reach of 10 feet.
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Treant Druid (Circle of the Land)

Use the treant template with the following modifications:

WIS 16 (+3) 18 (+4)

Challenge 9 (5 ,000 XP) 10 (5,900 XP)

Wild Shape:  max CR of 1/2; includes beasts with a swimming speed; can stay in beast shape for up to 3 hours per Wild Shape use.

Land’s Stride: Moving through nonmagical difficult terrain costs the treant druid no extra movement. The treant druid can also pass through nonmagical plants without being slowed by them and without taking damage from them if they have thorns, spines, or a similar hazard.  In addition, the treant druid has advantage on saving throws against plants that are magically created or manipulated to impede movement, such as those created by the entangle spell.

Spellcasting. The treant druid is a 6th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 16, +8 to hit with spell attacks). It has the following druid spells prepared:

Cantrips (at will): control flames (see Player's Companion - Elemental Evil), druidcraft, mending (applicable to plants, but not plant creatures), guidance
1st level (4 slots): create or destroy water, cure wounds, entangle, speak with animals
2nd level (3 slots): barkskin, locate animals and plants, pass without trace, spider climb, spike growth
3rd level (3 slots): call lightning, conjure animals, erupting earth (see Player's Companion - Elemental Evil), plant growth, protection from energy