Clockwork Deconstructor

Clockwork Heart When the clockwork deconstructor is reduced to 0 hitpoints, it can make a DC 10Constitution saving throw regaining 1 hitpoint on a  success. For each success, the DC increases by 5. The DC resets after a short or long rest

Construct Nature The clockwork deconstructor does not need to eat, breathe, or sleep

Disassemble When the clockwork deconstructor takes the Attack action against a construct or object, it can make one additional slam attack as part of that action.

False Appearance While motionless, the clockwork deconstructor is indistinguishable from a statue

Recycle When the clockwork deconstructor reduces a Medium or smaller object or construct to 0 hitpoints,the object or construct is instantly destroyed. The deconstructor regains 21 (6d6) hitpoints.

Immutable Form The clockwork deconstructor is immune to any effects or magic that would alter its form

Siege Monster The clockwork deconstructor can deal double damage to buildings and objects

Internal Clock The clockwork deconstructor has advantage on initiative checks.

Self Destruct When the clockwork deconstructor is reduced to 0 hitpoints, creatures in a 20ft. radius must make a DC 16 Dexterity saving throw. On a failed saving throw, it takes 17(3d10) fire damage

Smelting Core (HP 30, AC 21) Upon destroying its Smelting Core, the clockwork deconstructor cannot use its Recycle ability, Smelting Blast, or its Self Destruct feature. Upon losing its Smelting Core, the clockwork deconstructor takes 27 (6d8) fire damage.

Multiattack. The clockwork deconstructor can make three attacks: One with its heated maw and two with its slam

Heated Maw Melee Weapon Attack, +7 to hit, reach 5ft,one target. Hit: 18 (2d12+4) bludgeoning damage +9(2d8) fire damage.

Slam Melee Weapon Attack, +7 to hit, reach 5ft, one target. Hit: 11 (1d12+4) bludgeoning damage.

Smelting Blast(Recharge 5-6) Creatures in a 30ft. cone must succeed a DC 13 Constitution saving throw. On a failed saving throw it takes 17 (3d10) fire damage and17(3d10) acid damage and are restrained as it is coated in liquid metal.

The restrained creature must repeat the saving throw at the end of its next turn, becoming petrified on a failure or ending the effect on a success. Creatures reduced to 0 hitpoints by this attack are immediately turned to metal.

The petrification lasts until the creature is freed by the greater restoration spell or other magic.

On a successful saving throw, creatures take half damage and are not restrained.