Copper Turnkey

Conductor. When the Copper Turnkey takes lightning, the damage is reduced to 0 and the energy is redirected. All creatures within a 10ft radius must make a Dexterity saving throw (DC15). On a failed save, each creature takes 2d12 lightning damage (12) and half as much on a successful save.

Arcane Radar. The Copper Turnkey must make a Perception (WIS) check at the start of every turn or else it attacks with disadvantage.

Paralysis Gas. Target creature within 5ft of the Copper Turnkey must succeed on a Constitution saving throw (DC 12) or be paralyzed for 1 minute. Paralyzed creature may repeat saving throw at the end of each turn ending the effect on a success.

Slam Attack. Melee Weapon Attack: +6 to hit, reach 5 ft. Hit: 12 (2d8 + 4) bludgeoning damage. 

Chain Fist. RangedWeapon Attack: +6 to hit, range 20/40 ft. Hit:  12 (2d8 + 4) bludgeoning damage.

The Copper Turnkey has 3 Legendary Actions that replenish at the beginning of each turn.

Recharge. The Fixit Bug that remains with the Copper Turnkey makes repairs healing for 10 (2d8 +2).

Taze. Melee Weapon Attack: +6 to hit, reach 5 ft. Hit: 12 (2d10 + 2) lightning damage.

Roll Attack (Costs 2 Actions). The Copper Turnkey forms itself into a large ball and rolls up to 25ft. All creatures in its path makes a DC 14 (DEX) saving throw taking 12 (2d8 + 4) bludgeoning damage on a failed save or half as much on a success.