Animatronic (Fredrick)

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

Unholy Resistance. This creature is immune to the spell dispel Evil and Good and protection from Evil and Good.

Creature of the Night. At night, Fredrick's spirit possesses this construct. At dawn, when this construct is touched by natural sunlight, this construct becomes under the effects of the spell dispel Evil and Good, bypassing its Unholy Resistance trait, dispelling Fredrick's spirit from this construct. When Fredrick's spirit is not controlling this construct, it cannot take any actions or reactions.

Multiattack. Fredrick makes two melee attacks.

Slam. Melee Weapon Attack: +6 to hit, reach 5 ft., 1 target. Hit: 17 (2d12 + 4) bludgeoning damage. 

Shriek (Recharge 6). Fredrick makes a terrifying shriek, audible to those within 120 feet. Creatures who hear this shriek must make a DC 14 Wisdom saving throw or be paralyzed and frightened. The creature can repeat this saving throw at the end of each of their turns, ending the effect on a success.