Sinker of Boats. More dangerous than even the size of the ikuchi is the oil it produces almost constantly from its body. This oil is thicker than the surrounding water and impedes the movement of any creature moving through it, even those native to the Elemental Plane of Water. The ikuchi uses its oil to swamp small ships by slithering on board and filling the ship with its oil, gradually causing the ship to sink. Why the ikuchi goes to such lengths to sink watercraft is unknown, as the creatures are highly temperamental and are just as likely to ignore a vessel as they are to go after it.