Conductor

Infernal Corruption

After the Conductor drops to 0 hit points, the human turns into a demon. Change his hit points to 35 hp (5d6+5), resistance to fire damage, AC 15 (Natural Armor), and give resistance to all nonmagical bludgeoning, piercing, and slashing attacks and fire. After the demon phase is killed, he is truly dead and the fight is over.

Multiattack. 

In human form: The monster either makes one dagger attack and one unarmed strike or two unarmed strikes

In demon form: The monster makes two attacks of any kind, only one of which can be Burning Bite, Poisonous Tail, or fire

Dagger. Melee Weapon Attack: +4 to hit, reach 5 ft., 1 target. Hit: 5 (2d4 + 1) piercing damage.

Unarmed Strike. Melee Attack: +2 to hit, reach 5 ft., 1 target. Hit: 3 (1d4 + 1) bludgeoning damage.

Burning Bite. Melee Attack: +3 to hit, reach 5 ft., 1 target. Hit: 8(2d6 + 2) Fire damage.

Poisonous Tail. Melee Attack: +4 to hit, reach 5 ft., 1 target. Hit: 6 (2d4 + 2) Piercing damage.

Roll a Constitution DC 10 saving throw. If you fail you have disadvantage for your next action and attacks against you have advantage until the next turn.

You may use your reaction to knock someone prone.

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