5e SRD:Awakened Tree
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Huge plant, unaligned
False Appearance. While the tree remains motionless, it is indistinguishable from a normal tree.
Slam. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 14 (3d6 + 4) bludgeoning damage.
An awakened tree is an ordinary tree given sentience and mobility by the awaken spell or similar magic.