Nautical

Nautical is an item very similar to Burnt. It is obtained by touching the blue platform in place of Solaritium's statue after picking up the crowbar, and then heading outside behind the Temple and touching Nautical on its podium.

Gameplay
Nautical is used for nothing more than burning wood and unlocking access to the Hidden Town which has the God Artifact in one of the houses, and therefore unlocking access to the Sponge Ending.

Trivia

 * Nautical is usually seen as being a water-type ball due to the name and color of the object, but Nautical is apparently a fireball just like Burnt despite all of the indications that it is a water-type ball. This is proven with the fire effect that is shown when Nautical burns wood.