Chrono-Scrubber

Spider Climb. The Scrubber can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Janitorial Directive. In standard train cars, the Scrubber is indifferent to passengers unless attacked, impeded from its cleaning duties, or if it witnesses damage to the train. Inside a Ghost Car, its directive shifts to "Sterilize," making it hostile to all non-Constructs.

Multiattack. The Scrubber can attack twice with its Polishing Pincers

Polishing Pincer. Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit: 5 (1d4 + 3) slashing damage.

Temporal Tag (Recharge 5–6). Ranged Spell Attack: +5 to hit, range 30 ft., 1 target. Hit: 3 (1d6) necrotic damage as the Scrubber shoots a glob of glowing, ticking chronal-grease. For the next 8 hours, the target cannot benefit from the Invisible condition, and Category 2 or higher Constructs always know the exact distance and direction to the target if they are on the same train.

Scuttle. The Scrubber takes the Dash or Disengage action.