Sail burner

Sail burners were enchanted crossbow bolts used by sailors and pirates of the Nelanther Isles and the Sea of Swords.

Powers
Sail burners were hard to handle, but the bolts could be helpful in naval combat with enough practice. They burst into flames and torched the opponent vessel's sails when shot from a crossbow.

History
Sail burners were in common use in the late-14 century DR. Notably, Captain Allendry of the Midnight Rose outfitted his crew and offered the bolts for sale.