False Appearance. While the clockwork dragon remains motionless, it is indistinguishable from a metal statue.

Constructed Resilience:
The dragon doesn't need to eat, drink, or breathe.
The dragon doesn't need to sleep, and magic can't put it to sleep.

Regeneration (Van Form Only): While in van form, the dragon regains 10 hit points every hour. The Mending Cantrip can be cast to repair some damage and can be cast repeatedly.

Multiattack. The dragon makes two attacks: one with its bite and one with its claws.

Bite. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 17 (2d8 + 6) piercing damage.

Claw. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 12 (1d6 + 6) slashing damage.

Breath Weapons (Recharge 5–6). The dragon uses one of the following breath weapons.

Grease Breath. The clockwork dragon exhales Van Grease in a 30-foot cone. Each creature in that area must make a DC 18 Dexterity saving throw and be knocked prone & taking  (6d8) acid damage on a failed save, or half as much damage on a successful one and not be knocked prone.