Graphite Ingot for Upgrade

Processing Material: Sea Monster's Ooze x1 + Zinc Ingot Knowledge Item x100

A material used for upgrading cannons of a warship. Ingot made with fluid extracted from the bodies of sea monsters. There is a superstition among sailors that if the extracts of the sea monsters are mixed with the materials during the construction or upgrading of vessels, sea monsters could regard the ship as their kin and thus not attack the ship as much as they normally would.