Siege Engines

These are weapons used to attack strongholds or sometimes ships. Their cost may be up to twice as high in a remote location. A siege engine that throws missiles (a ballista, onager, or trebuchet) must have a trained artillerist to fire it; this is person making the attack rolls for the weapon. Missile-throwing engines have attack penalties, detailed below. Note that siege engines are not generally usable against individuals or monsters; the GM may make exceptions for very large monsters like giants or dragons.
Bore: A breaching tool, similar to the battering ram, save that it uses a screw or drill to continuously dig rather than break with blunt force. A bore ignores hardness. It is operated from under a sow, and cannot strike defenders. It takes a crew of four to operate.
Sow: A roofed structure on wheels, used to shelter a battering ram or bore and its users from attacks from above. Protection on the sides may be lighter or nonexistent. The roofing is Hardness/HP of 15/200.
Siege tower: A tall structure used in the siege of a fortified walled structure. The tower will not directly attack a wall, but will be tall enough to allow the attackers to get to the top of the wall. The tower will be built on wheels and pushed against a wall; once in place it will drop the front doors and allow the attackers to run across to the top of the wall. The attackers will use stairs or ladders inside the tower to climb to the top. Hardness and HP for a tower is 15/400.