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Archives of Nethys

Archives of Nethys

Pathfinder RPG (1st Edition) Pathfinder RPG (2nd Edition) Starfinder RPG

Rules Index | GM Screen | Player's Guide
GM Core / Chapter 4: Subsystems / Vehicles / Vehicle Basics

Propulsion

Source GM Core pg. 211 2.0
Vehicles typically travel over land, on water, or through the air, and their Speeds indicate their terrain and movement types. But vehicles also have a form of propulsion—the way in which their movement is powered—and this propulsion often has additional considerations.

There are five main types of propulsion: alchemical, magical, pulled, rowed, and wind. A vehicle can have more than one means of propulsion, though it usually uses only one type of propulsion at a time. For instance, a galley has both the rowed and the wind propulsion traits, meaning it can sail when the winds are favorable, but the crew can also lower the sails and row the ship when necessary. The vehicle's means of propulsion informs the skills a pilot can use for piloting checks (page 212), and some means of propulsion have additional rules.

Propulsion

The vehicles in Guns & Gears use the following new means of propulsion, in addition to the forms listed in the Gamemastery Guide.

Clockwork Propulsion

Powered by the measured release of energy stored in springs via winding, clockwork propulsion is a fragile thing of mechanical beauty and wonderous engineering. Clockwork vehicles can often be piloted with the Crafting skill.

A clockwork vehicle must be wound to remain operational. Clockwork vehicles have the Wind-Up trait, with the specifics listed in its stat block under the wind-up ability.

For a clockwork vehicle to move or take other actions, it must be wound by a creature using a unique key. This takes the amount of time listed. Once wound, it remains operational for the listed amount of time, after which time it becomes inactive and immobile until it's wound again. Some clockwork vehicles' abilities require them to spend some of their remaining operational time. They can't spend more than they have and shut down immediately once they have 0 time remaining. If it's unclear when a clockwork vehicle was last wound, most vehicles are re-wound approximately half-way through their operating time.

A clockwork vehicle can be placed into standby mode by its pilot as a 3-action activity. Its operational time doesn't decrease in standby.

A creature can attempt to Disable a Device to wind a clockwork vehicle down (with a DC listed in the wind-up entry). For each success, the clockwork vehicle loses 10 minutes of operational time. This can be done even if the clockwork vehicle is in standby mode.

Broken clockwork vehicles have difficulty holding energy. The first time each round a broken clockwork vehicle moves, it must make a DC 5 flat check. On a failure, it loses 10 minutes of operational time.

Electrical Propulsion

Electrical power, whether the vehicle uses magical electricity or the extremely rare new Stasian coil technology to store electricity without magic, allows for vehicles that make significantly less disturbance than some other propulsion methods. Electrical vehicles can often be piloted with the Crafting skill.

Alchemical

Source GM Core pg. 211 2.0
Powered by the reactions of alchemical reagents, controlled internal combustion, lighter-than-air gases, or steam, vehicles with alchemical propulsion tend to be powerful but have the potential to be wildly unpredictable. Alchemical vehicles can often be piloted using the Crafting skill.

Magical

Source GM Core pg. 211 2.0
Magically propelled vehicles are powered by spells, magic items, or an entirely magical engine. A magical propulsion system can be targeted with counteracting effects like dispel magic, using half the vehicle’s level rounded up for its counteract rank and a standard DC for the vehicle’s level for the counteract check. A creature can use Arcana, Nature, Occultism, or Religion (depending on the type of magic) for a magical vehicle’s piloting checks.

Pulled

Source GM Core pg. 211 2.0
This method of propulsion is perhaps the most common, wherein a wheeled conveyance (such as a carriage or wagon) is pulled by one or more creatures. The Speed of the vehicle can never exceed that of the slowest creature pulling the vehicle. The creatures pulling the vehicle don't act on their own; they instead act as part of the vehicle's actions, and their movement as part of those actions triggers reactions just as it does for the vehicle itself and its pilot.

When a pulled vehicle takes collision damage, so do the creatures pulling that vehicle (though they can typically attempt the basic Reflex saving throw to mitigate that damage). The death of one or more pulling creatures might damage or slow the vehicle, and it might cause the pilot to lose control.

For a vehicle pulled by an animal or similarly unintelligent creature, a pilot can use Nature for piloting checks; for sapient pulling creatures, the pilot can instead use Diplomacy or Intimidation for piloting checks.

Rowed

Source GM Core pg. 211 2.0
These vehicles are propelled by the power of creatures rowing the vehicle from within. The creatures rowing the vehicle act only as part of the vehicle's actions, and their movement as part of those actions triggers reactions just as it does for the vehicle itself and its pilot (though rowers often have some degree of cover).

When a rowed vehicle takes collision damage, so do the creatures rowing that vehicle (though they can typically attempt the basic Reflex saving throw to mitigate that damage). The death of one or more creatures might cause the vehicle to go out of control or slow the vehicle, but usually doesn't damage the vehicle.

A pilot on a vehicle rowed by other people can use Diplomacy or Intimidation for piloting checks.

Wind

Source GM Core pg. 211 2.0
Wind-propelled vehicles require some form of air movement to power them, and adverse wind conditions can cause them to stall or even go out of control. Wind vehicles that rely on cloth sails typically have weakness to fire. Pilots of wind-powered vehicles can use Nature for piloting checks.