Cloud ladder leaf heart

Cloud ladder trees are a rank seven immortal material. The leaves of ten thousand year old cloud ladder trees form the rank eight immortal material cloud ladder leaf heart. Once all of the leaf hearts are taken away, the tree collapses into a pile of wood dust and becomes an ordinary material. Leaves with an empty heart-shaped space mark trees whose leaf hearts have already been removed. On the island inside the blue dragon whale, explorers destroy such trees searching for remaining leaf hearts and find none. ^{ch. 1890}

Cloud ladder leaf hearts are named among the immortal materials prepared on that island, together with clear wind grass stems and rooster iron, after explorers realize the deposits were real and had already been taken. ^{ch. 1891}