Deep Roots. The voice of the forest cannot leave its domain by any means including teleportation. If destroyed, it regrows with all its Hit Points in a living tree in its domain at a time chosen by the DM within 1 year (such as the onset of spring).

Legendary Resistance (3/Day, or 4/Day in Lair). If the voice fails a saving throw, it can choose to succeed instead.

Magic Resistance. The voice has Advantage on saving throws against spells and other magical effects.

Multiattack. The voice makes three Branch attacks and uses Needle Deluge if available.

Branch. Melee Attack Roll: +12, reach 30 ft. Hit: 16 (3d6 + 6) Bludgeoning damage, and if the target is Large or smaller it is pulled up to 30 feet toward the voice and has the Grappled condition (escape DC 20).

Needle Deluge (Recharge 4-6). Dexterity Saving throw: DC 19, each creature in a 20-foot radius, 40-foot-high Cylinder originating from a point within 600 feet of the voice. Failure: 36 (8d8) Piercing damage. Success: Half damage.

Spellcasting. The voice casts one of the following spells, requiring no Material components and using Wisdom as the spellcasting ability (spell save DC 19):

At Will: Goodberry, Identify, Plant Growth, Suggestion
2/Day Each: Contagion, Cure Wounds (level 3 version), Dispel Magic
1/Day Each: Earthquake, Lignify (target becomes wood), Greater Restoration, Wall of Thorns

Tree Stride. If within 5 feet of a tree, the voice teleports to an unoccupied space within 5 feet of a second tree that is within 600 feet of the previous tree. The voice may choose to allow other creatures within 5 feet of it to teleport with it to a space within 5 feet of its destination. Alternatively, the voice melds into the tree.

Bark Blessing (3/Day). The voice casts Barkskin, Lesser Restoration, or Protection from Poison on a creature or plant within 30 feet of it.

Fiery Regrowth. Trigger: The voice, a Plant creature, or an ordinary plant within 600 feet of it takes Fire or Lightning damage. Response: That creature or plant regains 40 Hit Points and ceases burning.

Legendary Action Uses: 3 (4 in Lair). Immediately after another creature's turn, the voice can expend a use to take one of the following actions. The voice regains all expended uses at the start of each of its turns.

Command Trees. The voice commands an allied Plant creature within 60 feet to use its Reaction to move up to half its Speed and make a melee or ranged attack. If none are within range, the voice casts Awaken on a tree (creating an Awakened Tree) or other eligible plant within 60 feet.

Sylvan Step. The voice teleports using its Tree Stride.

Pollen Burst. Constitution Saving Throw: DC 19, each creature in a 20-foot-radius Sphere centered on a point within 60 feet of the voice. Failure: 10 (3d6) Poison damage, the target has the Poisoned condition until the start of the voice's next turn, and has Disadvantage on Perception checks that rely on sight, smell, or taste for 1 minute. Success: Half damage only. Failure or Success: The voice can't take this action again until the start of its next turn, and the DM sneezes.