Wondrous item, very rare
This lightweight cotton sail draws the air away from shipboard fires and snuffs them out before they can spread. Upon command, twice per day, these sails can extinguish a non-magical fire in a 10-foot cube anywhere on the ship. Alternately, the sails can be used to make a caster level check (1d20+5 vs a DC of 10 + the spell’s level) to dispel a magical fire effect on the ship. The ship’s captain or any spellcaster designated by the captain that has been on board the ship for at least 24 hours can use a reaction to use this effect to attempt to counterspell a fire spell or similar magical effect targeting the ship or creatures on board the ship. The sails must be rigged and unfurled in order to function. When the power of the sails is used, the sails fill with air, doubling the the ship’s movement for 1 round; this has no effect if the ship is anchored or moored.
Pirate Campaign Compendium © 2018, Legendary Games; Lead Designer Jason Nelson. Authors: Alex Augunas, Jeff Gomez, Matt Goodall, Jim Groves, Tim Hitchcock, Victoria Jaczko, Jonathan H. Keith, Lyz Liddell, Thomas J. Phillips, Alistair J. Rigg, Alex Riggs, Loren Sieg, Neil Spicer, Todd Stewart, Rachel Ventura, Michael D. Welham, Linda Zayas-Palmer.