There is a legend, a certain legend of magical weapons not even found in El Patron's Weapons. Vile. Cursed Weapons. Whoever controls these weapons control the entire sea.
Where they can be found
Killer Blade most commonly found at General Darkhart
Carnage Blade commonly found at General Sandspine
Slappy's Blades (Dagger, not the exact blade Slappy used) found at Timothy Dartan
Lost Sword of Slappy found from Slappy himself