siege monster. the war machine deals double damage to objects and structures

immutable form. the war machine is immune to any spell or effect that would alter its form

magic resistance. the war machine has advantage on saving throws against spells and other magical effects

demonic axiomatic mind. the war machine can't be compelled to act in a manner contrary to its nature or instructions, as long as the instructions are given by its demon lord 

unusual nature. the war machine doesn't require air, food; drink, or sleep

flesh crushing stride. the war machine moves up to its speed in a straight line. during this, it can enter huge or smaller creatures' spaces. a creature whose space the war machine enters must make a DC 19 dexterity saving throw. on a successful save, the creature is pushed to the nearest space out of the war machine's path. on a failed save, the creature falls prone and takes 43 (8d8) bludgeoning damage. if the war machine remains in the prone creature's space, the creature is also restrained until it's no longer in the same space as the war machine.while restrained in this way, the creature or another creature within 5 feet of it, can make a DC 19 strength check. on a success, the creature is shunted to an un occupied space of its choice within 5 feet of the war machine and is no longer restrained

imprisoning chain. the war machine targets one medium or smaller creature that it can see within 40 feet of it. the target must make a DC 17 strength saving throw. on a failed save, the target is pulled 15 ft towards the war machine and is grappled. if the target is ever pulled into the same space as the war machine,  the target is restrained and can make a DC 18 strength saving throw at the end of target's turn to escape

smash. Melee Weapon Attack: +4 to hit, reach 15 ft., one target. Hit: 28 (5d6 + 5) bludgeoning damage.

claw. Melee Weapon Attack: +5 to hit, reach 15 ft., one target. Hit: 28 (5d6 + 5) slashing  damage.

 demonic cannon. Ranged Weapon Attack: +3 to hit, range 120/240 ft., one target. Hit: 26 (7d6 + 5) necrotic damage.