You summon a colossal treant guardian from a living tree within range. The target tree must be Large or larger and rooted in natural soil. The guardian erupts from the tree's trunk, transforming it into a walking embodiment of the forest's will. The treant acts on your initiative and obeys your verbal commands.   It has AC 17, 150 HP, is immune to being charmed or frightened, and has tremorsense 30 feet. It makes two Slam attacks each turn (+10 to hit, 3d10 + 5 bludgeoning). On a critical hit, it may attempt to restrain the target (Strength save vs your spell save DC)