Weald Golem

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.

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

Lightning Absorption. Due to it's use as a lightning rod it regenerates from any lightning damage it takes. The Weald Golem regenerates a number of HP equal to the amount of lightning damage it took that turn. 

Multiattack. The golem makes two slam attacks, two sword attacks, or one of each.

Slam. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 19 (3d8 + 7) bludgeoning damage.

Sword. Melee Weapon Attack: +10 to hit. reach 10 ft., one target. Hit: 20 (3d8 +7)

Slow (Recharge 5–6). The golem targets one or more creatures it can see within 10 feet of it. Each target must make a DC 17 Wisdom saving throw against this magic. On a failed save, a target can't use reactions, its speed is halved, and it can't make more than one attack on its turn. In addition, the target can take either an action or a bonus action on its turn, not both. These effects last for 1 minute. A target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Entangle (Recharge 5-6). The golem casts the Entangle spell causing the targets within range to make a DC 17 Strength Saving Throw as vines attempt to wreath around the targets and stop their movement for up to one minute.

Breath Weapon Poison (Recharge 5-6). The Golem releases poisonous spores, and gas from vents on its head dealing 35 (7d8) Poison Damage in a 30 ft. cone 

Spike Growth (Recharge 5-6). The Golem slams it's fist into the ground and twists creating a Spike Growth. For each 5ft. you travel through the spikes you take 5d4 Piercing Damage. The Spikes count as difficult terrain.