Treant
Huge plant, chaotic good
Armor Class 16 (natural armor)
Hit Points 138 (12d12 + 60)
Speed 30 ft., swim 15 ft., climb 15 ft.
str
23 (+6)
dex
8 (-1)
con
21 (+5)
int
12 (+1)
wis
16 (+3)
cha
12 (+1)
Senses passive Perception 13
Languages Common, Druidic, Elvish, Sylvan
Challenge 9 (5,000 XP)
Siege Monster. The treant deals double damage to objects and structures.
Actions
Animate Trees. The treant magically animates up to two trees it can see within 60 feet of itself. Each tree uses the Treant stat block, except it has Intelligence and Charisma scores of 1, it can't speak, and it lacks this action. The tree takes its turn immediately after the treant on the same Initiative count, and it obeys the treant. A tree remains animate for 1 day or until it dies, the treant dies, or it is more than 120 feet from the treant. The tree then takes root if possible.
Hail of Bark. Ranged Attack Roll: +10, range 180 ft. 28 (4d10 + 6) Piercing damage.
Multiattack. The treant makes two Slam attacks.
Slam. Melee Attack Roll: +10, reach 5 ft. 16 (3d6 + 6) Bludgeoning damage.