Rolling Fortress

Tradition: Technomancy

Rank: Master

Castings: 1

Duration: 8 hours

You construct a Rolling Fortress inside the target space. It is a vehicle with Defense 5, Health 200, Size 10, Speed 5 (Strider). It takes no damage from cold and half damage from ordinary sources. The vehicle is self-propelled, though it requires a driver to steer it. Creatures can enter and exit the vehicle through one of two hatches. The fortress can hold creatures and objects whose total Size does not exceed 20 and no individual creature greater than Size 2.

The fortress also comes equipped with a heavy cannon. A creature inside the fortress can use an action to fire the cannon, sending a projectile to a point within 100 yards. When the projectile reaches that point or can travel no further, the projectile explodes inside a Size 5 space. Each object in the space takes 7d6 damage. Each creature in it takes 3d6 damage and makes an Agility roll. On a failure, the creature takes an extra 4d6 damage, falls prone, and becomes confused and vulnerable (luck ends). You must perform a ritual to reload the cannon.

If the fortress is destroyed, it explodes inside a Size 20 space centered on it. All creatures and objects inside the fortress take 20d6 damage. Each object in the affected space takes 10d6 damage and each unsecured object is pushed 5 yards. Each creature in the affected space takes 5d6 damage and makes a Strength roll. On a failure, it takes an extra 5d6 damage, is pushed 5 yards away, and falls prone.

When the spell ends, the fortress crumbles into challenging terrain that covers the ground in its space until cleared away.