found in a deep ocean and is fairly rare once you find it
you put a soul dew into the rock and one of the EON pair spawn and you fight it
proof of concept
https://cdn.discordapp.com/attachments/554456007896727564/557198946037137408/2019-03-18_13.48.46.png
https://cdn.discordapp.com/attachments/554456007896727564/557198913975877652/2019-03-18_13.48.57.png
https://cdn.discordapp.com/attachments/554456007896727564/557198887815741450/2019-03-18_13.48.52.png
leaf stone ore used as place holder island is not final