Nautical Ironwood

Nautical ironwood temporarily lends the strength of iron to the common wood used in a ship. This spell is most often used to reinforce the planking of a hull, and sometimes to brace spars and masts. Although the wood gains in strength, it becomes no heavier. The 8-cubic-foot area of effect can protect an area of the hull nearly 2 feet wide by 4 feet long. A 6th level wizard, for instance, could make a 6-foot by 8-foot area iron-strong, or a 4-foot by 12-foot one. Vulnerable areas near the waterline can be protected, or the prow reinforced if ramming is expected. Nautical ironwood doubles the normal damage capacity against impact, stress, and fire. Wood bespelled in this manner gains a saving throw of 6 against the effects of the warp wood spell. The spell lends itself to permanency.

The material components are a spike of iron and the dust of one small diamond of 500 gp value, which are consumed in the casting.