Treant

Ancient trees woken to a slow, deep awareness, guardians that stand watch over the oldest forests and crush anything that threatens their groves. At rest they are indistinguishable from ordinary timber.

Slam: bludgeoning, melee 10 ft, +5 to hit, 3d6+7 bludgeoning (two limbs). Rock Throw: bludgeoning, 60 ft, save Dex Quick, 3d10 bludgeoning (half on a save), cooldown 2 rounds. Rouse the Wood: control, awakens up to two nearby trees to fight at its side for 1 minute, cooldown special.

Bark Hide: resists nonmagical bludgeoning and piercing damage. False Appearance: while motionless, cannot be told from a normal tree. Fire Vulnerability: takes double damage from fire. Senses: Vibration Sense (feels movement, 90 ft), Dark Sense (30 ft).