Robust Construction (Reversible)

This spell makes a construction tougher and more robust for one encounter with a damaging event such as a storm, collision with a ship or reef, damaging spell such as a fireball, ramming, etc. The spell lasts for one encounter, but lasts for the duration of that encounter. While the encounter lasts, the construction gains a +1 bonus on saves vs. any type of damage per two levels of the caster. A ship with robust construction placed on it receives a saving throw (as the captain of the vessel) to resist warp wood.

As an example, Doroth (M5) the shipmage sees a storm on the horizon. She immediately casts a robust construction on the ship. Several hours later, the storm hits. The DM rules that the storm is equivalent to a large catapult hitting a thick wood wall, and the ship must make a saving throw once per hour until the storm has passed. See the DMG Table 52: Structural Saving Throws. The ship has a +3 bonus on all of its saving throws because of Doroth’s spell.

The caster must provide a few chips of material of the same type as the construction to be reinforced, (i.e., wood chips for a ship, stone chips for a stone wall).

The reverse of the spell, weaken construction, applies a -1 penalty to a structure’s saving throws per two levels of the caster. In this case, the structure receives a saving throw vs. the spell as the commander or captain of the structure.