Lumber Shredder

Immutable Form: The golem is immune to any spell or effect that would alter its form.

Magic Resistance: The golem has advantage on saving throws against spells and other magical effects.

Tree Feller: The lumberjack's attacks deal maximum damage to Plant creatures.

Steel Plating: The shredder ignores any damage it takes less than 10.

Engine Malfunction: When the shredder reaches 0 hit points, its engine overloads. At the start of its next turn, it explodes, causing a Fireball at its location.

Actions

Multiattack: The shredder makes two attacks, one with its Gripclaw, and one with its Sawblade.

Gripclaw: Melee weapon attack: +10 to hit, reach 5ft, one target. Hit: 9 (1d6+6) bludgeoning damage, and the target must make a DC 18 Strength saving throw or be Restrained. The shredder cannot attack with the Gripclaw while it is grappling a creature.

Sawblade: Melee weapon attack: +10 to hit, reach 5ft, one target. Hit: 19 (3d8+6) slashing damage.

Engine Overload (recharge 4-6): The shredder uses Flamethrower or Lumbering Charge.

• Flamethrower: All creatures in a 30-foot cone must make a DC +15 Dexterity saving throw. On a failure, they take 18 (4d8) fire damage, or half as much on a success.
• Lumbering Charge: The shredder surges forward, forcing all creatures in a 30-foot long line that is 15 feet wide to make a Strength saving throw. On a failure, they take 7 (2d6) bludgeoning damage and are knocked Prone. On a success, they take half damage and are not knocked prone.