Bone Ice

Icy cold bone material. Said to be from ancient Ghosts that refused to fade or pass. Or the bones of ancient Traces and Echoes solidified. They are actually the remains of Po ghosts of giant creatures from when the world was young. Bone Ice materials may be shaped by ghostly hand. Things made of it fade and evaporate in the mortal realm when exposed to sunlight. If broken or burnt, things made of Bone Ice return restored to bonded owners the next night.