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

Fey Hybrid. The treant is also a fey.

Siege Monster. The treant deals double damage to objects and structures.

Snow Traveler. The treant ignores movement restrictions caused by ice or snow.

Snowy Boughs. When the treant takes damage, if it isn't fire or psychic damage, snow drops from the treant's branches onto the ground within 10 feet of it. Snow turns the ground into difficult terrain until it melts, and each other creature in the area must succeed on a DC 13 Dexterity saving throw or be knocked prone and take 4 (1d8) bludgeoning damage plus 4 (1d8) cold damage. This effect can only happen once per turn.

Multiattack. The treant makes two slam attacks.

Slam. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 16 (3d6 + 6) bludgeoning damage plus 4 (1d8) cold damage, and the target's speed is reduced to 0 feet until the end of its next turn unless it has resistance or immunity to cold damage.

Rock. Ranged Weapon Attack: +10 to hit, range 60/180 ft., one target. Hit: 28 (4d10 + 6) bludgeoning damage plus 7 (2d6) cold damage. Hit or miss, the rock shatters into a cloud of mist, dust, and snow that fills a 10-foot radius sphere centered on the target. The cloud is heavily obscured and lasts until the end of the treant's next turn or until a wind of moderate or greater speed (at least 10 miles per hour) disperses it.

Animate Trees (1/Day). The treant magically animates one or two trees it can see within 60 feet of it. These trees have the same statistics as a normal treant, except they have Intelligence and Charisma scores of 1, they can't speak, they have resistance to cold damage, and they have only the Slam action option. An animated tree acts as an ally of the treant. The tree remains animate for 1 day or until it dies; until the treant dies or is more than 120 feet from the tree; or until the treant takes a bonus action to turn it back into an inanimate tree. The tree then takes root if possible.