Caterpillar Carriage
CREATURE 18The constructs of the Clicking Caverns all have similar designs, being made of clockwork. The most unusual feature of them is that they're self-replicating, or perhaps self-reincarnating, since the animation of a haunted construct requires a soul.
The haunted construct known as the caterpillar carriage is composed of armored segments that flow over one another as the carriage inches forward. It has two forelegs that dig grooves into the ground, making way for the many wheels situated along its underside.
Tremorsense allows a monster to feel the vibrations through a solid surface caused by movement. It is an imprecise sense with a limited range (listed in the ability). Tremorsense functions only if the monster is on the same surface as the subject, and only if the subject is moving along (or burrowing through) the surface.
A monster with darkvision can see perfectly well in areas of darkness and dim light, though such vision is in black and white only. Some forms of magical darkness, such as a 4th-rank Darkness spell, block normal darkvision. A monster with Greater Darkvision, however, can see through even these forms of magical darkness.
4d10+4 bludgeoning, DC 40 basic Fortitude
The monster deals the listed amount of damage to any number of creatures Grabbed or Restrained by it. Each of those creatures can attempt a basic Fortitude save with the listed DC.
The caterpillar carriage absorbs a willing construct within its reach. That construct doesn't exist separately until the caterpillar carriage releases it as an Interact action or is destroyed.
The caterpillar carriage can burrow through solid stone at a Speed of 20 feet. It can leave a tunnel if it desires, and it usually does.
Huge or Smaller, Wheel, DC 40 basic Reflex
The monster Strides up to double its Speed and can move through the spaces of creatures of the listed size, Trampling each creature whose space it enters. The monster can attempt to Trample the same creature only once in a single use of Trample. The monster deals the damage of the listed Strike, but trampled creatures can attempt a basic Reflex save at the listed DC (no damage on a critical success, half damage on a success, double damage on a critical failure).
The monster can instead use Improved Grab as an action and choose one creature it's grabbing or restraining with an appendage that has Improved Grab to automatically extend that condition to the end of the monster's next turn.