Flesh-Crushing Stride. The hellfire engine moves up to its speed in a straight line. During this move, it can enter Large or smaller creatures' spaces. A creature whose space the hellfire engine enters must make a DC 18 Dexterity saving throw. On a successful save, the creature is pushed to the nearest space out of the hellfire engine's path. On a failed save, the creature falls prone and takes 28 (8d6) bludgeoning damage. If the hellfire engine remains in the prone creature's space, the creature is also restrained until it's no longer in the same space as the hellfire engine. While restrained in this way, the creature, or another creature within 5 feet of it, can make a DC 18 Strength check. On a success, the creature is shunted to an unoccupied space of its choice within 5 feet of the hellfire engine and is no longer restrained.

Hellfire Weapons. The hellfire engine uses one of the following options:

If the chosen option kills a creature, the creature's soul rises from the River Styx as a lemure in Avernus in 1d4 hours. If the creature isn't revived before then, only a wish spell or killing the lemure and casting true resurrection on the creature's original body can restore it to life. Constructs and devils are immune to this effect.