Chain golem

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

Conductive. Whenever the Golem takes lightning or fire damage each creature caught on its barbs takes a max of 2d6 of the triggering damage roll.

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

Magic Weapons.  The golem's weapon attacks are magical.

Multiattack. The golem makes 2 Slam attacks

Slam. Melee Weapon Attack: +9 to hit, reach 15 ft., 1 target. Hit: 29 (4d10 + 5) bludgeoning damage. 

Barbed launcher. (recharge special) The golem fires barbed hooks attached to chains out in a 90ft cone. Up to 5 creatures within the area must make a dexterity save DC19 or take, 4d8 piercing damage and be caught on the barb. A creature can move while caught but can't move further than 120ft away from the golem. A creature or creature within 5ft can use an action on its turn to remove the barb. The caught creature takes 1d8 slashing damage when the barb is removed from it.

Reel in.  The golem draws all the chains it fired out from its Barbed launcher. Each barb is pulled 40ft toward the golem and any creatures caught on the barbs are pulled with them taking 1d6 slashing damage. If a barb did not hit a creature it crates difficult terrain starting from the max range of the Barbed launcher. If creatures are pulled adjacent to the golem they are grappled by the golem in an unoccupied space within 5ft of the golem. Once all the chains are Reeled in Barbed launcher recharges.