Kairoseki

Kairoseki (or Seastone in english dubs) is an ore found deep on the ocean's floor and near oceans.

It is used to enchant weapons with kairoseki effects allowing its wielder to hit logias.

In a smithing table combine your weapon of choice with 10 kairoseki ores to enchant it.

Kairoseki can also be used in crafting items such as bullets, handcuffs, nets or blocks and bars, all of which help players in dealing with devil fruit users without haki.

When holding kairoseki items devil fruit users will receive a weakness effect slowing them down and disabling ability usage. Which items are affected by this "kairoseki" side effect are labeled in their description with a yellow "Kairoseki" label (or "Seastone" if using the Dub Pack).