The lost swords

The Hokami aka the fire God is a sword that can be set ablaze.

The Raikami aka lightning God is a sword that can make its user move at the speed of light.

The Kukikami aka the air God is a sword that uses highly pressurised air to strike at long distances.

The Mizukami aka the water God is a sword that can manipulate water.

These swords are know as the lost swords. They are very strong.

They were made during the void century.

The only know users are. http://shipoffools.wikia.com/wiki/Fox_D._Zephyr   And. http://shipoffools.wikia.com/wiki/Yamato_D_Rain

External links. http://onepiece.wikia.com/wiki/Void_Century